Timeline of free and open-source software

This article presents a timeline of events related to popular free/open-source software. For a narrative explaining the overall development, see the related history of free and open-source software.

The Achievements column documents achievements a project attained at some point in time (not necessarily when it was first released).

By the 2000s the number of open source software packages in wide use was so large that it would be infeasible to make a definitive list.

• History of free and open-source software
• List of free and open-source software packages
• Timeline of programming languages – many programming languages are open source
• Timeline of operating systems – quite a few operating systems are open source
• Timeline of Linux adoption
• Timeline of the open-access movement
• History of Linux
  • Linux kernel § History

• A brief history of open-source software