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++