Projects

• Jamal - 2.0</kbd> 🔴<br>Extendable template engine embedded into Maven/JavaDoc, supporting multiple extensions (Groovy, Ruby, JavaScript, JShell, PlantUml) with support for snippet handling.
• jstachio - 3-Clause</kbd> 🔴<br>Typesafe Mustache templating engine.
• jte - 2.0</kbd> 🟢<br>Compiles to classes, and uses an easy syntax, several features to make development easier and provides fast execution and a small footprint.
• Jtwig
• Rocker
• StringTemplate
• Awaitility - 2.0</kbd> 🟠<br>DSL for synchronizing asynchronous operations.
• ConcurrentUnit - 2.0</kbd> 🔴<br>Toolkit for testing multi-threaded and asynchronous applications.
• Hoverfly Java - 2.0</kbd> 🟢<br>Native bindings for Hoverfly, a proxy which allows you to simulate HTTP services.
• Karate - automation, mocks and performance-testing making testing REST/HTTP services easy.
• REST Assured - 2.0</kbd> 🟢<br>DSL for easy testing of REST/HTTP services.
• WebTau - 2.0</kbd> 🟠<br>Test across REST-API, Graph QL, Browser, Database, CLI and Business Logic with consistent set of matchers and concepts.
• Cucumber
• Cukes-REST - 2.0</kbd> 🔴<br>Collection of Gherkin steps for REST-service testing using Cucumber.
• J8Spec - like syntax.
• Lamdba Behave
• Serenity BDD
• AutoParams
• Beanmother - 2.0</kbd> 🔴<br>Sets up beans from YAML fixtures.
• Datafaker - 2.0</kbd> 🟢<br>Modern fake data generator forked from Java Faker.
• Fixture Factory - 2.0</kbd> 🔴<br>Generates fake objects from a template.
• jFairy - 2.0</kbd> 🟢<br>Fake data generator.
• Instancio - 2.0</kbd> 🟢<br>Automates data setup in unit tests by generating fully-populated, reproducible objects. Includes JUnit 5 extension.
• Randomized Testing - 2.0</kbd> 🟢<br>JUnit test runner and plugins for running JUnit tests with pseudo-randomness.
• Java Faker
• Mockneat - 2.0</kbd> 🔴<br>Another fake data generator.
• JMock - 2.0</kbd> 🟢<br>JMock is a high-performance data generation and simulation component library implemented in Java.
• cdi-test - 2.0</kbd> 🟢<br>JUnit extension for easy and efficient testing of CDI components.
• weld-testing - 2.0</kbd> 🟢<br>Set of test framework extensions (JUnit 4, JUnit 5, Spock) to enhance the testing of CDI components via Weld. Supports Weld 5.
• selenium - 2.0</kbd> 🟢<br>Browser automation framework and ecosystem.
• JsonUnit - 2.0</kbd> 🟢<br>Library that simplifies JSON comparison in tests.
• XMLUnit - 2.0</kbd> 🟢<br>Simplifies testing for XML output.
• ConsoleCaptor - 2.0</kbd> 🟢<br>Captures console output for unit testing purposes.
• junit-dataprovider - 2.0</kbd> 🟠<br>TestNG-like data provider/runner for JUnit.
• LogCaptor - 2.0</kbd> 🟢<br>Captures log entries for unit testing purposes.
• log-capture
• Mutability Detector - 2.0</kbd> 🟠<br>Reports whether instances of a given class are immutable.
• raml-tester - 2.0</kbd> 🔴<br>Tests if a request/response matches a given RAML definition.
• Selfie - 2.0</kbd> 🟢<br>Snapshot testing (inline and on disk).
• Stebz - approach framework for test steps managing.
• Testcontainers
• Mockito
• Moco
• PowerMock - 2.0</kbd> 🔴<br>Mocks static methods, constructors, final classes and methods, private methods, and removal of static initializers.
• EasyMock
• Arthas - 2.0</kbd> 🟢<br>Allows to troubleshoot production issues for applications without modifying code or restarting servers.
• cactoos - oriented primitives.
• Chocotea - 2.0</kbd> 🔴<br>Generates postman collection, environment and integration tests from java code.
• Dex - 2.0</kbd> 🔴<br>Java/JavaFX tool capable of powerful ETL and data visualization.
• dregex - 2-Clause</kbd> 🟠<br>Regular expression engine that uses deterministic finite automata. It supports some Perl-style features and yet retains linear matching time, and also offers set operations.
• Embulk - 2.0</kbd> 🟢<br>Bulk data loader that helps data transfer between various databases, storages, file formats, and cloud services.
• fswatch - 2.0</kbd> 🟢<br>Micro library to watch for directory file system changes, simplifying java.nio.file.WatchService.
• Gephi - 3.0</kbd> 🟢<br>Cross-platform for visualizing and manipulating large graph networks.
• Guava - 2.0</kbd> 🟢<br>Collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and more.
• Javadoc Publisher - 2.0</kbd> 🟠<br>Generate Javadoc from your maven/gradle project and deploy it automatically on GitHub Page.
• JavaVerbalExpressions
• JKScope - 2.0</kbd> 🔴<br>Java scope functions inspired by Kotlin.
• minio-java - 2.0</kbd> 🟢<br>Provides simple APIs to access any Amazon S3-compatible object storage server.
• Semver4j
• Underscore-java
• jenv
• SDKMan - 2.0</kbd> 🟢<br>Java Version Manager inspired by RVM and rbenv. Supports UNIX-based platforms and Windows.
• Crawler4j - 2.0</kbd> 🔴<br>Simple and lightweight web crawler.
• webmagic - 2.0</kbd> 🟠<br>Scalable crawler with downloading, url management, content extraction and persistent.
• Blade - 2.0</kbd> 🟢<br>Lightweight, modular framework that aims to be elegant and simple.
• Takes - Oriented Programming and immutability.
• WebForms Core
• flowable - 2.0</kbd> 🟢<br>Compact and efficient workflow and business process management platform.
• Pinpoint - 2.0</kbd> 🟢<br>Open-source APM tool.
• JavaPackager - 3.0</kbd> 🟠<br>Maven and Gradle plugin which provides an easy way to package Java applications in native Windows, macOS or GNU/Linux executables, and generate installers for them.
• Eclipse Collections
• JsonSurfer
• OpenJ9 - calibre, flexibly licensed, openly-governed cross-platform JVM extending and augmenting the runtime technology components from the Eclipse OMR and OpenJDK project.
• Intelligent java - 2.0</kbd> 🔴<br>Seamlessly integrate with remote deep learning and language models programmatically.
• AutoMQ - 2.0</kbd> 🟢<br>AutoMQ is a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective.
• Membrane Service Proxy - 2.0</kbd> 🟢<br>Open-source, reverse-proxy framework.
• Light-4J - 2.0</kbd> 🟢<br>Fast, lightweight and productive microservices framework with built-in security.
• Fury - 2.0</kbd> 🟢<br>Blazing fast object graph serialization framework powered by JIT and zero-copy.
• Pact JVM - 2.0</kbd> 🟢<br>Consumer-driven contract testing.
• bucket4j - 2.0</kbd> 🟢<br>Rate limiting library based on token-bucket algorithm.
• Agrona - 2.0</kbd> 🟢<br>Data structures and utility methods that are common in high-performance applications.
• SBE - 2.0</kbd> 🟢<br>Simple Binary Encoding, one of the fastest message formats around.
• Spring Data Dynamic Query - 2.0</kbd> 🟠<br>Unified dynamic query interface for Spring Data JPA, MongoDB, and Elasticsearch, enabling advanced JOIN(s), OR logic, scoped conditions, powerful projections and advanced features with zero boilerplate.
• Sierra - 2.0</kbd> 🟢<br>Lightwieght declarative DSL for rapid development of Swing applications.
• Dragonwell8 - 2.0</kbd> 🟢<br>Downstream version of OpenJDK optimized for online e-commerce, financial, logistics applications.
• Open HTML to PDF
• Orienteer - 2.0</kbd> 🔴<br>Open-source business application platform for rapid configuration/development of CRM, ERP, LMS and other applications.
• jSciPy
• Erupt - 2.0</kbd> 🟢<br>Annotation-Driven Low-Code & JPA Visualization.
• Emissary - 2.0</kbd> 🟠<br>Simple, lightweight, yet FAST messaging library for decoupling messages (requests and events) and message handlers.
• Boot Usage Spring Boot Starter - 2.0</kbd> 🟢<br>Spring Boot Actuator extension providing application startup and runtime metrics including JVM uptime, memory usage, and CPU load.
• JamJet - 2.0</kbd> 🟢<br>Agent runtime with a Java SDK for building AI agents, supporting graph-based workflow orchestration, multi-agent coordination, and MCP/A2A protocols.
• AliveJTUI - style TUI library for building terminal UIs as component trees with diff-based rendering, focus management, and themes.
• Delta Coverage
• Spring CRUD Generator - 2.0</kbd> 🟢<br>Maven plugin for generating Spring Boot CRUD applications from YAML/JSON specifications.
• ClearConfig - 2.0</kbd> 🟢<br>Type-safe, composable configuration library with a focus on runtime clarity.
• Open J Proxy - 2.0</kbd> 🟢<br>Type 3 JDBC driver and Layer 7 proxy server for decoupling applications from relational database connection management.
• Jollyday - 2.0</kbd> 🟢<br>Determines the holidays for a given year, country/name and eventually state/region.
• Dimension-DI - 2.0</kbd> 🟢<br>JSR-330 runtime dependency injection using the JDK Class-File API.
• Sheetz - 2.0</kbd> 🟢<br>Reads and writes Excel, CSV and ODS files with annotation mapping, streaming, styling and validation.
• Parallel Collectors - 2.0</kbd> 🟢<br>Stream API Collectors for parallel processing with custom thread pools, designed for I/O-heavy workloads.
• Nyagram - safe framework for Telegram bots based on Spring Boot 3 and Java 21.
• mybatis-dynamic - first dynamic ORM for MyBatis with runtime schema modification.
• Heap Seance - 2.0</kbd> 🟠<br>Memory leak diagnostics that orchestrates jcmd, jmap, jstat, JFR, Eclipse MAT, and async-profiler into a structured investigation workflow with confidence-based verdicts.
• JVM Hotpath - level execution frequency analysis to identify algorithmic bottlenecks.
• Certificate Ripper - 2.0</kbd> 🟢<br>CLI tool and library for extracting and exporting server certificates from HTTPS endpoints.
• Kensa - 2.0</kbd> 🟢<br>Code-first BDD framework for Java and Kotlin that generates interactive HTML reports and sequence diagrams from test code.
• skipper-java - time test execution control via Google Spreadsheet, enabling instant toggle without code changes.
• java-util - 2.0</kbd> 🟢<br>Zero-dependency, high-performance utilities featuring Converter (universal type conversion), DeepEquals, CaseInsensitiveMap, TTLCache, CompactMap, MultiKeyMap, and object graph traversal.
• Jctx
• java-refined - dependency refinement types for Java 8+ with type-safe wrappers covering numerics, strings, and collections.
• Sift - 2.0</kbd> 🟢<br>Type-safe, AST-based Regex Builder focused on readability and ReDoS prevention.
• tinystruct - 2.0</kbd> 🟢<br>Lightweight, pluggable framework for building Java applications with CLI, HTTP, and modular extension support.
• Anahata ASI - 2.0</kbd> 🟢<br>Java agent container with local LLM adapters, stateful tool execution, context management and IDE integration.
• Dokimos - agent applications that scores responses, validates tool calls and execution traces, and catches quality regressions in CI.
• liter-llm
• Regulus
• Immuto - safe mapper implementations for Java Records using canonical constructors, with zero runtime reflection.
• jar-cart - configuration package manager and runner for the Java ecosystem written in Go, focusing on developer productivity and build speed.
• google-java-format
• JHarmonizer
• Palantir Java Format - 2.0</kbd> 🟢<br>Formatter based on google-java-format with wider lines and lambda-friendly output.
• CRUDGen - 2.0</kbd> 🟢<br>Compile-time annotation processor generating CRUD layers, DTOs, JSON Patch, and custom HTTP endpoints for Spring Boot.
• sealed-env
• HashSmith - style SWAR/SIMD control-byte probing, optimized for memory efficiency.
• Wormhole4j - 2.0</kbd> 🟢<br>High-performance sorted map with fast range scans and thread-safe concurrent access, based on the Wormhole index structure.
• Actual Schema Gradle Plugin - 2.0</kbd> 🟢<br>Generates PostgreSQL schema DDL from Liquibase migrations using Testcontainers.
• CFR
• Fernflower - 2.0</kbd> 🟢<br>Java decompiler with broad JVM bytecode support.
• JD-Core - 3.0</kbd> 🔴<br>Core Java decompiler library.
• Procyon
• transformer-api - 2.0</kbd> 🟢<br>Unified API that exposes multiple decompilers through one in-memory transformation interface.
• Vineflower - 2.0</kbd> 🟢<br>Modern maintained fork of Fernflower.
• Nuts
• html-to-markdown - compatible Markdown through a Java binding.
• jackson-dataformat-spreadsheet - 2.0</kbd> 🟢<br>Jackson dataformat module for reading and writing Excel (XLSX/XLS) as POJOs via `ObjectMapper`.
• xberg
• Wickra - 2.0</kbd> 🟢<br>Technical-analysis library with 514 streaming O(1)-per-tick indicators on a native Rust core, on Maven Central as org.wickra:wickra; more indicators and incremental updates than the pure-Java ta4j.
• BeanIO - 2.0</kbd> 🔴<br>Maps flat files of fixed-length or delimited records to and from Java beans using XML or annotation configuration.
• fixedformat4j - 2.0</kbd> 🟢<br>Annotation-driven mapping of fixed-width flat files to and from POJOs and Java records.
• Flatpack - 2.0</kbd> 🟠<br>Parses and writes delimited and fixed-length flat files with optional column-mapping definitions.
• FlatLaf - 2.0</kbd> 🟢<br>Modern Swing Look and Feel with Darcula and IntelliJ themes.
• JQuickCurl
• sklearn-java - 2.0</kbd> 🟢<br>Implements scikit-learn-style machine learning algorithms in pure Java.
• JQuick Java - like scripting language for dynamic rule engines with XML orchestration and Java interoperability.
• java-ngrok
• GraphCompose
• jquick-pdf - like templates and ECharts-style charts using iText 7, without a browser dependency.
• Argus - profiler, heap analysis and machine-readable health verdicts.
• OfficeFloor - 2.0</kbd> 🟢<br>Spring Boot add-on that adds explicit function orchestration to REST endpoints, with each endpoint's steps, branches and error flows in one YAML file whose directory path maps to the URL.
• Selenium Boot - boilerplate Selenium + TestNG framework with auto driver management, smart retry, self-healing locators, AI failure analysis, and a built-in HTML report.
• test-watch-maven-plugin - inspired watch mode for tests with smart selection and parallel execution.
• crawlberg
• Spring AI - 2.0</kbd> 🟢<br>Application framework for AI engineering for Spring.
• Apache Maven - 2.0</kbd> 🟢<br>Declarative build and dependency management that favors convention over configuration. It might be preferable to Apache Ant, which uses a rather procedural approach and can be difficult to maintain.
• Bazel - 2.0</kbd> 🟢<br>Tool from Google that builds code quickly and reliably.
• Gradle - 2.0</kbd> 🟢<br>Incremental builds programmed via Groovy instead of declaring XML. Works well with Maven's dependency management.
• ReleaseRun
• Byte Buddy - 2.0</kbd> 🟢<br>Further simplifies bytecode generation with a fluent API.
• Byteman - 2.1-or-later)
• Recaf
• cache2k - 2.0</kbd> 🔴<br>In-memory high performance caching library.
• Ehcache - 2.0</kbd> 🟢<br>Distributed general-purpose cache.
• Infinispan - 2.0</kbd> 🟢<br>Highly concurrent key/value datastore used for caching.
• Airline - 2.0</kbd> 🟢<br>Annotation-based framework for parsing Git-like command-line arguments.
• JCommander - 2.0</kbd> 🟠<br>Command-line argument-parsing framework with custom types and validation via implementing interfaces.
• picocli - 2.0</kbd> 🟢<br>ANSI colors and styles in usage help with annotation-based POSIX/GNU/any syntax, subcommands, strong typing for both options and positional args.
• jQAssistant - 3.0</kbd> 🟢<br>Static code analysis with Neo4J-based query language.
• JSpecify - 2.0</kbd> 🟢<br>Standardized nullness annotations designed to work uniformly across various Java IDEs, compilers, and static analysis tools.
• ToolsHref - to-Mermaid visualization tool.
• Cobertura - 2.0</kbd> 🔴<br>Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics.
• JaCoCo
• OpenClover - code instrumentation, with build-tool and IDE integrations.
• Spotless - 2.0</kbd> 🟢<br>A versatile code formatter for Gradle and Maven that enforces multiple styles (including Google and Palantir) across Java and other languages.
• Avaje Http Server - 2.0</kbd> 🟢<br>Generates Lightweight JAX-RS style http servers using Javalin or Helidon (Nima) SE.
• Immutables - 2.0</kbd> 🟢<br>Annotation processors to generate simple, safe and consistent value objects.
• Joda-Beans - 2.0</kbd> 🟠<br>Small framework that adds queryable properties to Java, enhancing JavaBeans.
• Lombok
• ANTLR - 3-Clause</kbd> 🟠<br>Complex full-featured framework for top-down parsing.
• JavaCC - 3-Clause</kbd> 🔴<br>Parser generator that generates top-down parsers. Allows lexical state switching and permits extended BNF specifications.
• JFlex
• BoofCV
• ImageJ
• avaje config - 2.0</kbd> 🟢<br>Loads yaml and properties files, supports dynamic configuration, plugins, file-watching and config event listeners.
• Curator Framework - 2.0</kbd> 🟢<br>High-level API for Apache ZooKeeper.
• microconfig - 2.0</kbd> 🔴<br>Configuration system designed for microservices which helps to separate configuration from code. The configuration for different services can have common and specific parts and can be dynamically distributed.
• Choco - 3-Clause</kbd> 🟢<br>Off-the-shelf constraint satisfaction problem solver that uses constraint programming techniques.
• Timefold - 2.0</kbd> 🟢<br>Flexible solver with Spring/Quarkus support and quickstarts for the Vehicle Routing Problem, Maintenance Scheduling, Employee Shift Scheduling and much more.
• jackson-dataformat-csv - 2.0</kbd> 🟢<br>Jackson extension for reading and writing CSV.
• Super CSV - 2.0</kbd> 🔴<br>Powerful CSV parser with support for Dozer, Joda-Time and Java 8.
• Apache Avro - 2.0</kbd> 🟢<br>Data interchange format with dynamic typing, untagged data, and absence of manually assigned IDs.
• Apache Orc - 2.0</kbd> 🟢<br>Fast and efficient columnar storage format for Hadoop-based workloads.
• Apache Parquet - 2.0</kbd> 🟢<br>Columnar storage format based on assembly algorithms from Google's paper on Dremel.
• Apache Thrift - 2.0</kbd> 🟢<br>Data interchange format that originated at Facebook.
• Apache Calcite - 2.0</kbd> 🟢<br>Dynamic data management framework. It contains many of the pieces that comprise a typical database management system.
• Apache Drill - 2.0</kbd> 🟢<br>Distributed, schema on-the-fly, ANSI SQL query engine for Big Data exploration.
• Apache Phoenix - 2.0</kbd> 🟢<br>High-performance relational database layer over HBase for low-latency applications.
• ArcadeDB - 2.0</kbd> 🟢<br>Multi-model database supporting graphs, documents, key-value, time series, and vector embeddings with SQL, Cypher, Gremlin, MongoDB, and Redis API compatibility.
• Debezium - 2.0</kbd> 🟢<br>Low latency data streaming platform for change data capture.
• druid - 2.0</kbd> 🟢<br>High-performance, column-oriented, distributed data store.