Actor Frameworks

• Akka.NET - Community-driven port of the popular Java/Scala framework Akka to .NET.
• Akkling - F# typed API for Akka.NET.
• Orleankka - Functional extension for Microsoft Orleans framework.
• Orleans - Distributed virtual actor model.
• Proto.actor - Cross-platform actor framework for .NET, Go, Java and Kotlin.

Build Tools

• Xake - Another Make utility implementation on F#, fully declarative with no-brain parallelism, inspired by Shake.
• FAKE - "F# Make" is a cross platform build automation system.

Cloud

• FsFirestore - Functional F# library to access Firestore database hosted on Google Cloud Platform (GCP) or Firebase.
• Chia - An F# library which contains HelperFunctions for reporting, logging and Azure cloud operations.
• Farmer - Repeatable Azure deployments with ARM templates made easy.
• Pulumi.FSharp.Extensions - F# computational expressions to reduce boilerplate in Pulumi code.

Code Analysis

• Ionide FSharp.Analyzers.SDK - Library for building custom analyzers for F# / FSharp.Analyzers.Cli.

Code Generation

• Hawaii - A dotnet CLI tool to generate type-safe F# clients from OpenAPI/Swagger services.
• Myriad - A pre-compilation code generator.

Compilers for Other Platforms

• Fable - F# to JavaScript compiler.
• Fez - F# to Erlang compiler.
• FunScript - F# to JavaScript compiler with JQuery etc. mappings through a TypeScript type provider.
• Juniper - Functional Reactive Programming for the Arduino and other microcontrollers.

Concurrent, Asynchronous, and Parallel Programming

• FSharp.Control.AsyncSeq - Asynchronous sequence support, integration with IAsyncEnumerable.
• FSharp.Control.FusionTasks - F# Async workflow <--> .NET Task/ValueTask easy seamless interoperability library.
• FSharpx.Async - Collection of asynchronous programming utilities for F#.
• Hopac - Concurrent ML style concurrent programming library for F#.
• Ply - High performance System.Threading.(Value)Task computation expressions for F#.
• TaskBuilder.fs - F# computation expression builder for System.Threading.Tasks.
• IcedTasks - Cold tasks, cancellable tasks, and extensions for the async workflow.
• FIO - A type-safe, highly concurrent and asynchronous library for F# based on pure functional programming.
• Reaction.AsyncRx - An implementation of Async Observables in F# for .NET and Fable.

Configuration

• Argu - Declarative CLI argument/XML configuration parser for F# applications.
• FsConfig - F# library for reading configuration data from environment variables and AppSettings with type safety.
• Skid - Simple, single-file portable CLI utility for configuration templating.
• docopt.fs - Command line arguments parser, F# port of docopt.

Data Science

• DiffSharp - Functional automatic differentiation (AD) library.
• FsLab - A collection of libraries for data-science. It provides a rapid development environment that lets you write advanced analysis with few lines of production-quality code.
• IfSharp - F# for Jupyter Notebooks.
• m2cgen - A CLI tool to transpile trained classic ML models into a native F# code with zero dependencies.
• Math.NET Numerics - Methods and algorithms for numerical computations in science, engineering and every day use. F# specific bindings available.
• Synapses - Neural network library in F#.
• SIMDArray - SIMD enhanced Array extensions for faster computation.
• Deedle - Exploratory data library for .NET.
• Math.NET Symbolics - A basic open source computer algebra library for .NET, Silverlight and Mono written entirely in F#.

Development Tools

Editor Plugins

• Emacs F# mode - F# support in Emacs (including Intellisense and Interactive mode).
• FSharpFar - F# support for Far Manager.
• FSharpLint - F# code linter.
• Fantomas - F# code formatter.
• VimSpeak - A tool to control Vim with your voice using speech recognition.
• fsharp-notebook - Data science notebook for F# Interactive.
• neofsharp.vim - Basic F# support for (Neo)Vim.
• Ionide - Atom Editor and Visual Studio Code package suite for cross platform F# development.
• Vim F# - F# support for Vim.

IDE

• F# Playground - Minimal playground for F#.
• Visual Studio - IDE from Microsoft with first class F# support (Windows only, Proprietary).

Performance Analysis

• fasm - F# JIT disassembler, as a dotnet tool.

F# Wrappers for Popular .NET Libraries

• ASP.NET Core Blazor
• System.Text.Json
• Avalonia
• ASP.NET Core - fsharp/Giraffe) (+ optionally Saturn)Oxpecker|
• MSTest
• WPF
• MAUI - dev/Fabulous) |

Game Development

Performance Analysis

• FsUnity - F# libraries, tools, and plugins for the Unity game engine.
• Godot - Tutorial how to use F# with Godot.
• Garnet - Lightweight game composition library for F# with entity-component-system (ECS) and actor-like messaging features.
• Nu Game Engine - Cross-platform F# 2D game engine built in the functional style. Uses SDL2 and Farseer Physics.

General Purpose Libraries

Performance Analysis

• Aether - Optics library for F#, similar to the Haskell Data.Lens package.
• Chessie - Railway-oriented programming.
• Donald - A simple F# interface for ADO.NET.
• DustyTables - Thin F# API for SqlClient for easy data access to ms sql server with functional seasoning on top.
• ExtCore - Extended core library for F#.
• FSharp.CosmosDb - An F# wrapper around the CosmosDB SDK, making it more functional-friendly.
• FSharpLu - Lightweight utilities for string manipulations, logging, collection data structures, file operations, text processing, security, async, parsing, diagnostics, configuration files and Json serialization.
• FSharpx.Extras - A collection of libraries and tools for use with F#.
• Fli - Computational expression to run system processes and manage their output.
• Fling - Significantly reduces boilerplate needed to efficiently save/load complex domain entities to/from multiple tables.
• FsToolkit.ErrorHandling - Clear, simple and powerful error handling with railway-oriented programming. Inspired by Chessie.
• Fumble - Thin F# API for SQLite for easy data access to SQLite database with functional seasoning on top.
• LiteDB.FSharp - F# Support for LiteDB, an embedded single file database for .NET.
• Npgsql.FSharp - Thin F# wrapper around Npgsql, the PostgreSQL database driver.
• TypeShape - Small, extensible F# library for practical generic programming.
• Validus - A composable validation library for F#, with built-in validators for most primitive types and easily extended through custom validators.
• Vp.FSharp.Sql - Generic F# ADO provider wrapper (SqlServer, PostgreSQL, SQLite).
• SqlHydra - Suite of NuGet packages for working with databases in F# including query expressions and code generation tools (for generating strongly typed F# DTO record types based on your database tables). Supports MySQL, PostgreSQL, Oracle, SQL Server, and SQLite.
• FSharp.HashCollections - Fast hash-based immutable map and set.
• FSharpPlus - Extensions for F#.

GUI

Performance Analysis

• Avalonia.FuncUI - Develop cross-platform MVU GUI Applications using F# and Avalonia.
• Elmish.WPF - Elmish (or MVU) approach to WPF programming.
• Epoxy - An independent flexible XAML MVVM library for .NET.
• Fabulous - F# functional app development, using declarative dynamic UI.

HTTP Clients

Performance Analysis

• Http.fs - A simple, functional HTTP client library for F#.
• Oryx - A high performance .NET cross-platform functional HTTP request handler library for writing HTTP clients and orchestrating web requests.
• FsHttp - A convenient library for consuming HTTP/REST endpoints via F#.

Logging

Performance Analysis

• FsLibLog - A single file you can copy and paste or add through Paket GitHub dependencies to provide your F# library with a logging abstraction.
• Logary - High performance, multi-target logging, metric, tracing and health-check library for mono and .NET.

Main Language-Related Repositories

• F# main repository
• F# projects
• F# suggestions
• F# RFCs

.NET Core Templates

Creating Type Providers

• ASP.NET Core WebAPI F# Template - dotnet new -i WebAPI.FSharp.Template::*
• Expecto Template - dotnet new -i Expecto.Template::*
• Giraffe Template - dotnet new -i "giraffe-template::*"
• MiniScaffold - F# Template for creating and publishing libraries targeting .NET Full (net45) and Core (netstandard1.6), dotnet new -i MiniScaffold::*
• NancyFx Template - dotnet new -i NancyFx.Core.Template::*
• SAFE Stack Template - dotnet new -i SAFE.Template::*
• Fable, F# |> Babel - dotnet new -i Fable.Template::*
• Fable-elmish - dotnet new -i Fable.Template.Elmish.React::*

Package Management

Performance Analysis

• NuGet - The package manager for the Microsoft development platform including .NET.
• Paket - Dependency manager for .NET with support for NuGet packages and Git repositories.

Parsing

Performance Analysis

• FParsec - The parser combinator library for F#.
• FsAttoparsec - Port of Bryan O'Sullivan's attoparsec from Haskell to F#.
• XParsec - Extensible, type-and-source-polymorphic, non-linear applicative parser combinator library for F# 3.0 and 4.0.

Resources

Blogs

• .NET Blog (F# tag) - News and discussions about F# from the .NET team.
• Krzysztof Cieslak - A blog of the Ionide maintainer.
• Sergey Tihon (F# Weekly) - Weekly newsletter collected across the ecosystem.
• Mark Seemann - A blog discussing various aspects of software design.
• Codesuji - A community member blog, focusing on functional aspects on F#.
• Tomas Petricek - A well-known community member working on a diverse set of topics.

Books

• F# in Action by Isaac Abraham - A practical guide in software development in F#.
• Domain Modeling Made Functional by Scott Wlaschin - Tackle software complexity with domain-driven design and F#.

Cheatsheets

• F# Snips - Share your snippets of F# code.
• Learn F# in Y minutes - A guide recommended to quickly start programming in F#.
• Guide for C# devs to learn F# - A 30-minute F# tutorial for C# programmers, with back-to-back code snippets.
• Guide for Python devs to learn F# - A 30-minute F# tutorial for Python programmers, with back-to-back code snippets.
• F# cheatsheet - Quick reference for the main language features.
• Guide for Rust devs to learn F# - Informal manual for users of Rust and F# to read through to learn about the other language.
• F# tour - Official language tour from Microsoft.

Community

• F# on Discourse
• F# on BlueSky
• F# on Discord
• F# on Reddit
• F# on Telegram
• F# on Twitter
• Amplifying F#

Courses

• Write yourself a scheme in 48 hours using F#

Other Lists

• Awesome .NET! - Collection of awesome .NET libraries, tools, frameworks and software.
• Companies using F# - Community curated list of companies that use F# (maybe useful if you're looking for a job?)
• Fable Resources - A curated list of useful Fable-related tutorials, libraries and software.
• F# Community Projects - Everything produced by the F# community.

Videos

• F# Chats on performance
• Fast Dictionary in F#
• Intro to F#
• Amplifying F# YouTube Channel
• F# Online YouTube Channel
• Austin F# Meetup Group Recorded Presentations
• Topological Sort

Websites

• F# for Fun and Profit - Reference tutorials.
• Decompiler.com - Online C#/VB/F# decompiler.
• DotNetFiddle - Online REPL.
• SharpLab - C#/VB/F# compiler playground.
• Try F# - Online tutorials, currently without execution of code due to Silverlight dependency.
• Community for F# - Links to dojos and recordings of community presentations.
• F# Software Foundation - Main website.
• cs2fs - Transform C# code to F# code.
• fantomas-tools - A set of Fantomas related tools like AST viewer and online bug reporter.

Serialization

Performance Analysis

• FSharp.SystemTextJson - System.Text.Json extensions for F# types.
• FsCodec - F# Event-Union Contract Encoding with versioning tolerant converters.
• FsPickler - Fast, multi-format messaging serializer for .NET.
• Legivel - F# Yaml 1.2 parser.
• Thoth.Json - JSON encoder/decoder library inspired by Elm.
• FSharp.Json - Reflection-based serialization library.
• Fleece - JSON mapper for F#. It simplifies mapping from a Json library's JsonValue onto your types, and mapping from your types onto JsonValue.

Simulation

Performance Analysis

• F# RISC-V Instruction Set formal specification - RISC-V CPU formal ISA Specification. RISC-V CPU simulator with ELF files execution.

Static Site Generators

Performance Analysis

• SkunkHTML - Markdown blog with GitHub Pages.

Testing

Performance Analysis

• Expecto - Smooth testing framework for F# with tests-as-values and parallelism by default.
• Faqt - Fantastic fluent assertions for your F# tests and domain code.
• FsCheck - Random testing for .NET.
• FsUnit - Makes unit-testing with F# more enjoyable. It adds a special syntax to your favorite .NET testing framework.
• NBomber - Simple load testing framework for Pull and Push scenarios.
• Persimmon - Unit test framework for F# using computation expressions.
• altcover - Cross-platform coverage gathering and processing tool set for .NET/.NET core and Mono.
• canopy - F# web automation and testing framework.
• fsharp-hedgehog - Property-based testing system for F#.
• unquote - Write F# unit test assertions as quoted expressions.
• xUnit.net - Free, open source, community-focused unit testing tool for the .NET Framework.

Type Providers

Creating Type Providers

• FSharp.TypeProviders.StarterPack - The ProvidedTypes SDK for creating F# type providers.

Performance Analysis

• AzureStorageTypeProvider - F# Azure type provider which can be used to explore Blob, Table and Queue Azure Storage assets and easily apply CRUD operations on them.
• DynamicsCRMProvider - Type provider for Microsoft Dynamics CRM 2011.
• EasyBuild.FileSystemProvider - Type provider to provide a typed representation of files and directories based on your project structure or a virtual file system.
• ExcelProvider - Excel type provider.
• FSharp.Configuration - The project contains type providers for the configuration of .NET projects. Handles AppSettings, ResX, Yaml and Ini files.
• FSharp.Data.Npgsql - F# type providers library on a top of well-known Npgsql ADO.NET client library.
• FSharp.Data.SqlClient - F# type provider for statically typed access to T-SQL command parameters and result set.
• FSharp.Data.Tdms - TDMS support for F#.
• FSharp.Data.Toolbox - Library for various data access APIs based on FSharp.Data. The library currently includes the Twitter type provider for access to Twitter users and feeds, and SAS type provider to read SAS dataset files.
• FSharp.Data.TypeProviders - Library that contains type providers for .edmx files, .dbml files, WSDL services, OData services, and SQL databases.
• FSharp.Management - The project contains various type providers for the management of the machine. Handles file system, registry, Windows Management Instrumentation, PowerShell and SystemTimeZones.
• FSharp.Text.RegexProvider - Type provider for regular expressions.
• Facil - Generates F# data access source code from SQL queries and stored procedures.
• FsXaml - F# Tools for working with XAML Projects.
• FsYaml - Typed Yaml library for F#.
• GraphProvider - .dgml state machine type provider.
• MatDataProvider - Erased type provider for .mat files (binary MATLAB format files).
• S3Provider - Experimental type provider for Amazon S3.
• SQLProvider - General F# SQL database erasing type provider, supporting LINQ queries, schema exploration, individuals, CRUD operations and much more besides.
• SwaggerProvider - Generative type provider for Swagger.
• FSharp.Data - Data science library that contains type providers for CSV, HTML, JSON, XML, and WorldBank data.
• R Type Provider - Type provider to interop with R.

Visualization

Creating Type Providers

• FSharp.Charting - Charting library suitable for interactive F# scripting.
• GG.Net - Visualization library for data scientists.
• Plotly.NET - A Plotly-based general purpose plotting library for F#.
• SharpVG - Create SVG vector graphics in F#.
• XPlot - A plotting library for the F# programming language.