Hellcarrier
Hellcarrier is a freeware computer game developed by Free Lunch Design in 2001. The game is open source, as the source code can be downloaded from their site, listed below.
The object of the game is to complete each mission while controlling a military helicopter. The player is able to upgrade their helicopter with items collected throughout the game. The game is set in both the desert and the arctic. The player may choose a co-pilot who they believe to has the most experience.