Statistics of open source games

The list is by no means complete but I thought I would share some statistics about the ~200 investigated open source games projects.

State

Approximately 50% are mature, 25% in development and not yet mature and about 20% abandoned.

This may be skewed though because games in development are definitely harder to spot than mature projects.

Most used Programming languages

• C++ (40%)
• C (24%)
• Java (8%)
• Python (8%)
• Lua (4%)
• Javascript (2%)

A solid knowledge in C/C++ or Java or Python will be very useful for aspiring open source contributors.

Copyright

Most often the code is licensed by

• GPL-2.0 (37%)
• GPL-3.0 (19%)
• MIT (13%)
• Custom (7%)

 which means that open source projects in general prefer to keep modifications open source too.