Error Monitoring

• VirtualBox - Virtualization product from Oracle Corporation.
• Bitnami - Freely available VMs for applications described in this list: [GitLab](https://bitnami.com/stack/gitlab), [Jenkins](https://bitnami.com/stack/jenkins), [MantisBT](https://bitnami.com/stack/mantis), [Redmine](https://bitnami.com/stack/redmine), [Trac](https://bitnami.com/stack/trac) and [more](https://bitnami.com/stacks).
• Vagrant - Tool for building complete development environments.
• KVM - Linux kernel virtualization infrastructure.
• Ganeti - Cluster virtual server management software tool built on top of KVM and Xen.
• Packer - A tool for creating identical machine images for multiple platforms from a single source configuration.

Error Monitoring

• Haroopad - Markdown editor with live preview.
• GNU Emacs - An extensible, customizable text editor-and more.
• ICEcoder - Code editor awesomeness, built with common web languages.
• Lime - Aims to provide an open source solution to Sublime Text
• jotgit - Git-backed real-time collaborative code editing.
• Haroopad - Markdown editor with live preview.

Error Monitoring

• Lighttpd - Web server more optimized for speed-critical environments.
• Squid - Caching proxy for the web supporting HTTP, HTTPS, FTP, and more.
• HAProxy - Software based load Balancing, SSL offloading and performance optimization, compression, and general web routing.
• Cherokee - Lightweight, high-performance web server/reverse proxy.
• Nginx - Reverse proxy, load balancer, HTTP cache, and web server.
• Varnish - HTTP based web application accelerator focusing on optimizing caching and compression.

• Riemann - Flexible and fast events processor allowing complex events/metrics analysis.
• Icinga - Fork of Nagios.
• Naemon - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features.
• Shinken - Another monitoring framework.
• Thruk - Multibackend monitoring webinterface with support for Naemon, Nagios, Icinga and Shinken.
• Sensu - Open source monitoring framework.
• Zenoss - Application, server, and network management platform based on Zope.
• Whoops - Self-hosted tool for logging application events like errors or background worker completion.
• Cacti - Web-based network monitoring and graphing tool.
• Seyren - An alerting dashboard for Graphite.
• System Monitor - Web based system monitor
• Dash - A low-overhead monitoring web dashboard for a GNU/Linux machine.
• Flapjack - Monitoring notification routing & event processing system
• Stashboard - An open-source status dashboard running on App Engine.
• Cabot - Monitoring and alerts, similar to PagerDuty.
• Zabbix - Enterprise-class software for monitoring of networks and applications.
• Centreon - IT infrastructure and application monitoring for service performance.
• check_mk - Collection of extensions for Nagios.
• Shinken - Another monitoring framework.
• LibreNMS - fork of Observium.
• Alerta - Distributed, scaleable and flexible monitoring system
• Whoops - Self-hosted tool for logging application events like errors or background worker completion.

Error Monitoring

• Errbit - Error catcher compatible with Airbrake API, in Ruby.
• Squash - Exception reporting and bug analysis tool in Ruby.
• Sentry - Application monitoring, event logging and aggregation in Python.

Error Monitoring

• OpenTSDB - Store and server massive amounts of time series data without losing granularity.
• Dashing - Ruby gem that allows for rapid statistical dashboard development. An all HTML5 approach allows for big screen displays in data centers or conference rooms.
• Graphite-ng - Next generation graphite server.
• Diamond - Python based statistic collection daemon.
• OpenTSDB - Store and server massive amounts of time series data without losing granularity.
• Collectd - System statistic collection daemon.
• Dashing - Ruby gem that allows for rapid statistical dashboard development. An all HTML5 approach allows for big screen displays in data centers or conference rooms.
• dattss - Realtime Statistics Aggregation Service.
• Graph-Explorer - A graphite dashboard that's different, from Vimeo.
• InfluxDB - Open source distributed time series database with no external dependencies.
• Ganglia - High performance, scalable RRD based monitoring for grids and/or clusters of servers. Compatible with Graphite using a single collection process.
• Graph-Explorer - A graphite dashboard that's different, from Vimeo.
• KairosDB - Fast distributed scalable time series database, fork of OpenTSDB 1.x.
• Statsd - Application statistic listener.
• Collectl - High precision system performance metrics collecting tool.
• RRDtool - Open source industry standard, high performance data logging and graphing system for time series data.
• dattss - Realtime Statistics Aggregation Service.
• Graphite-ng - Next generation graphite server.
• Tessera - A flexible dashboard front-end for Graphite.

Error Monitoring

• MariaDB - Community-developed fork of the MySQL.
• Firebird - True universal open source database.
• PostgreSQL-XL - Scalable Open Source PostgreSQL-based database cluster.
• Galera - Galera Cluster for MySQL is an easy-to-use high-availability solution with high system up-time, no data loss, and scalability for future growth.

Error Monitoring

• Mailpile - A modern, fast web-mail client with user-friendly encryption and privacy features.

Error Monitoring

• DokuWiki - Simple to use and highly versatile wiki that doesn't require a database.
• ikiwiki - A wiki compiler.
• MoinMoin - An advanced, easy to use and extensible WikiEngine with a large community of users.
• Gollum - A simple, Git-powered wiki with a sweet API and local frontend.
• Ōlelo Wiki - A a wiki that stores pages in a Git repository.
• Mediawiki - Used to power Wikipedia.

Error Monitoring

• Gearman - Fast multi-language queuing/job processing platform.
• BeanstalkD - A simple, fast work queue.

Error Monitoring

• Digital Ocean Tutorials - A surprisingly vast resource for getting the basics of certain applications, tools, or even systems administration topics. (Note: Digital Ocean pays authors for this content)
• CONTRIBUTING
• Gource - Software version control visualization
• High Scalability - Blog to help you build successful scalable websites.
• GitFlow - Git extensions to provide high-level repository operations for Vincent Driessen's branching model.
• High Scalability - Blog to help you build successful scalable websites.
• GitFlowCheatsheet - GitFlow cheatsheet
• Gource - Software version control visualization

Error Monitoring

• OpenVPN - Uses a custom security protocol that utilizes SSL/TLS for key exchange.
• SoftEther - Multi-protocol software VPN with advanced features
• tinc - Distributed p2p VPN.
• SigmaVPN - SigmaVPN is simple, light-weight and modular VPN software for UNIX systems, deploying the NaCl encryption library.
• sshuttle - Poor man's VPN.
• OpenVPN - Uses a custom security protocol that utilizes SSL/TLS for key exchange.

Error Monitoring

• The Linux Command Line - A book about the Linux command line by William Shotts.
• OpenSSL Cookbook - A free ebook about OpenSSL basics and how to create secure configurations by Ivan Ristić.
• The Visible Ops Handbook: Implementing ITIL in 4 Practical and Auditable Steps - Is a methodology designed to jumpstart implementation of controls and process improvement.

Error Monitoring

• Haraka - A high-performance, pluginable SMTP server written in JavaScript.
• OpenSMTPD - Secure SMTP server implementation from the OpenBSD project.
• Postfix - Fast, easy to administer, and secure Sendmail replacement.
• Qmail - Secure Sendmail replacement.
• Maildrop - Open Source disposable email SMTP server, also useful for development.

Error Monitoring

• Metronome IM - Fork of Prosody IM.
• Openfire - Real time collaboration (RTC) server.
• Prosody IM - XMPP server written in Lua.
• Tigase - XMPP server implementation in Java.

Error Monitoring

• GestióIP - An automated web based IPv4/IPv6 IP Address Management tool.
• Netdot - A NETwork DOcumentation Tool, designed to help network administrators collect, organize and maintain network documentation.

Error Monitoring

• SpamAssassin - A powerful and popular email spam filter employing a variety of detection techniques.
• Wazuh - HIDS based on OSSEC with the Elastic Stack
• AIDE - The Advanced Intrusion Detection Environment, developed as a free replacement for Tripwire as a data integrity tool.
• nprobe - NetFlow analysis/audit toolkit.
• ntopng - High-Speed Web-based Traffic Analysis and Flow Collection.
• Yasat - Scan configuration files, kernel parameters and shows the best practices for each cases.
• Denyhosts - Thwart SSH dictionary based attacks and brute force attacks.
• Fail2Ban - Scans log files and takes action on IPs that show malicious behavior.

Error Monitoring

• Webalizer - Fast, free web server log file analysis program.
• Analog - The most popular logfile analyser in the world.
• Analog - The most popular logfile analyser in the world.
• GoAccess - Open source real-time web log analyzer and interactive viewer that runs in a terminal.

Error Monitoring

• GNU Bazaar - Distributed revision control system sponsored by Canonical.

Error Monitoring

• DevOpsGuys - Devops consultants who blog about operations.
• Code as Craft - Etsy's Ops blog, lots of technical posts.

Error Monitoring

• TWW Toolsets - Hyper package management system,both toolsets and package sources are free (Python).
• fpm - Versatile multi format package creator.
• TWW Toolsets - Hyper package management system,both toolsets and package sources are free (Python).
• CMake - Cross-platform build and packaging software.
• tito - Builds RPMs for git-based projects.

Error Monitoring

• Corosync - The Corosync Cluster Engine is a Group Communication System with additional features for implementing high availability within applications.
• fleet - fleet ties together systemd and etcd into a distributed init system.

Error Monitoring

• Tuleap - Written in PHP.
• The Bug Genie - Written in PHP.
• Gogs - Written in Go.
• GitLab - Clone of GitHub written in Ruby.
• Phabricator
• GitBucket
• Tuleap - Written in PHP.

Error Monitoring

• Couchbase - In-memory, replicated, peristent key/value datastore.
• FlockDB - Twitter's distributed, fault-tolerant graph database.
• LevelDB - Google's high performance key/value database.
• Redis - Networked, in-memory, key-value data store with optional durability.
• Hypertable - C++ based BigTable-like DBMS, communicates through Thrift and runs either as stand-alone or on distributed FS such as Hadoop.

Error Monitoring

• pywinrm - Python client to control WinRM.
• winrm - Ruby client to control WinRM.

Error Monitoring

• shipyard - Shipyard is a web UI for http://docker.io
• Fig - Fast, isolated development environments using Docker.
• Fig - Fast, isolated development environments using Docker.
• dokku - Docker powered mini-Heroku in around 100 lines of Bash

Error Monitoring

• DadaMail - Mailing List Manager, written in Perl.

Error Monitoring

• mitmproxy - A Python tool used for intercepting, viewing and modifying network traffic. Invaluable in troubleshooting certain problems.
• Wireshark - Open-source packet analyzer. Previously known as Ethereal.
• Nmap - Security scanner, with host discovery, port scanning, version detection and OS detection capabilities.
• Sysdig - Capture system state and activity from a running Linux instance, then save, filter and analyze.

Error Monitoring

• Remi - Repository with LAMP updated packages for RHEL/Centos/Fedora.

Error Monitoring

• pdsh - Pdsh is a high-performance, parallel remote shell utility.
• SSH Power Tool - Execute commands and upload files to many servers simultaneously without using pre-shared keys.
• parallel-ssh - Provides parallel versions of OpenSSH and related tools.
• Mosh - The mobile shell.
• Cluster SSH - Controls a number of xterm windows via a single graphical console.
• autossh - Automatically respawn ssh session after network interruption.

Error Monitoring

• TheBugGenie - Open source ticket system with extremely complete users rights granularity.
• osTicket - Open source support ticket system.
• MantisBT - Another web-based bug tracking system.
• Otrs - A free and open-source trouble ticket system software package that a company, organization, or other entity can use to assign tickets to incoming queries and track further communications about them.