A curated list of amazingly awesome Free and Open-Source sysadmin resources. Please read the Pull Request template if you wish to add software and consider donating to the FLOSS projects you use regularly. Please consider contributing to fix one of the pinned issues if your time allows.

• Software
  • Automation
  • Backups
  • Build and software organization tools
  • ChatOps
  • Cloud Computing
  • Code Review
  • Configuration Management
  • Configuration Management Database
  • Continuous Integration & Continuous Deployment
  • Control Panels
  • Databases
  • Deployment Automation
  • Diagramming
  • Distributed Filesystems
  • DNS - Control Panels & Domain Management
  • DNS - Servers
  • Editors
  • Identity Management
  • Identity Management - LDAP
  • Identity Management - Single Sign-On (SSO)
  • Identity Management - Tools and web interfaces
  • IT Asset Management
  • Log Management
  • Mail Clients
  • Metrics & Metric Collection
  • Miscellaneous
  • Monitoring
  • Network Configuration Management
  • PaaS
  • Packaging
  • Project Management
  • Queuing
  • Remote Desktop Clients
  • Router
  • Service Discovery
  • Software Containers
  • Status Pages
  • Troubleshooting
  • Version control
  • Virtualization
  • VPN
  • Web
• List of Licenses
• External links
• Communities / Forums
• Repositories
• Websites
• License

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Build automation.

• Apache Ant - Automation build tool, similar to make, a library and command-line tool whose mission is to drive processes described in build files as targets and extension points dependent upon each other. (Source Code) Apache-2.0 Java
• Apache Maven - Build automation tool mainly for Java. A software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information. (Source Code) Apache-2.0 Java
• Bazel - A fast, scalable, multi-language and extensible build system. Used by Google. (Source Code) Apache-2.0 Java
• Bolt - You can use Bolt to run one-off tasks, scripts to automate the provisioning and management of some nodes, you can use Bolt to move a step beyond scripts, and make them shareable. (Source Code) Apache-2.0 Ruby
• GNU Make - The most popular automation build tool for many purposes, make is a tool which controls the generation of executables and other non-source files of a program from the program's source files. (Source Code) GPL-3.0 C
• Gradle - Another build automation system. (Source Code) Apache-2.0 Groovy/Java
• Rake - Build automation tool similar to Make, written in and extensible in Ruby. (Source Code) MIT Ruby

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Backup software.

See also: Restic's list of Linux backup software

• Backupninja - Lightweight, extensible meta-backup system, provides a centralized way to configure and coordinate many different backup utilities. GPL-2.0 Shell
• Backrest - Backrest is a web UI and orchestrator for restic backup. (Source Code) GPL-3.0 Docker/Go
• Bareos - Cross-network backup solution which preserves, archives, and recovers data from all major operating systems. (Source Code) AGPL-3.0 C++/C
• Barman - Backup and Recovery Manager for PostgreSQL. (Source Code) GPL-3.0 Python
• BorgBackup - Deduplicating archiver with compression and authenticated encryption. (Source Code) BSD-3-Clause Python
• Burp - Network backup and restore program. (Source Code) AGPL-3.0 C
• Dar - Which stands for Disk ARchive, is a robust and rich featured archiving and backup software of the tar style. (Source Code) GPL-2.0 C++
• Duplicati - Backup client that securely stores encrypted, incremental, compressed backups on cloud storage services and remote file servers. (Source Code) LGPL-2.1 C#
• Duplicity - Encrypted bandwidth-efficient backup using the rsync algorithm. (Source Code) GPL-2.0 Python
• Open Archiver - Email archiving solution with full-text search and eDiscovery search features. (Source Code) AGPL-3.0 Docker
• Minarca - Client–server backup platform with a centralized web console to manage and restore Linux, Windows, and macOS backups via GUI or CLI. (Source Code) AGPL-3.0 Python
• Proxmox Backup Server - Proxmox Backup Server is an enterprise-class, client-server backup solution thatis capable of backing up virtual machines, containers, and physical hosts. (Source Code) GPL-3.0 Rust
• rclone - Command-line program to sync files and directories to and from different cloud storage providers.. (Source Code) MIT Go
• Rdiff-backup - Reverse differential backup tool, over a network or locally. (Source Code) GPL-2.0 Python
• Restic - Easy, fast, verifiable, secure and efficient remote backup tool. (Source Code) BSD-2-Clause Go
• Rsnapshot - Filesystem snapshot utility based on rsync. (Source Code) GPL-2.0 Perl
• Shield - A pluggable architecture for backup and restore of database systems. MIT Go
• UrBackup - Client/Server Open Source Network Backup for Windows, MacOS and Linux. (Source Code) AGPL-3.0 C/C++

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Build and software organization tools.

• EasyBuild - EasyBuild builds software and modulefiles for High Performance Computing (HPC) systems in an efficient way. (Source Code) GPL-2.0 Python
• Environment Modules - Environment Modules provides for the dynamic modification of a user's environment via modulefiles. (Source Code) GPL-2.0 Tcl
• Lmod - Lmod is a Lua based module system that easily handles the MODULEPATH Hierarchical problem. (Source Code) MIT Lua
• Spack - A flexible package manager that supports multiple versions, configurations, platforms, and compilers. (Source Code) MIT/Apache-2.0 Python

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Conversation-driven development and management.

_See also: /r/chatops*

• Eggdrop - The oldest Internet Relay Chat (IRC) bot still in active development. (Source Code) GPL-2.0 C
• Errbot - Plugin based chatbot designed to be easily deployable, extensible and maintainable. (Source Code) GPL-3.0 Python
• Hubot - A customizable, life embetterment robot. (Source Code) MIT Nodejs

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Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct active management by the user.

Please visit Cloud Native Software Landscape

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Code review is a software quality assurance activity in which one or several people check a program mainly by viewing and reading parts of its source code.

Please visit awesome-selfhosted/Software Development - Project Management

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Configuration management (CM) is a systems engineering process for establishing and maintaining consistency of a product's performance, functional, and physical attributes with its requirements, design, and operational information throughout its life.

• Ansible - Provisioning, configuration management, and application-deployment tool. (Source Code) GPL-3.0 Python
• CFEngine - Configuration management system for automated configuration and maintenance of large-scale computer systems. (