Raptor: Call of the Shadows
DOS has always been a great platform for games - DOS saw a lot of great games, including the 2D flight attack game Raptor: Call of the Shadows by Apogee Software. The source code to Raptor: Call of the Shadows is now available under the GNU GPL. Developer "skynettx" worked with original Raptor developer Scott Host, and other developers, to release the source code as Free software under the GNU General Public License. You can find it at DOS Raptor on GitHub. This is distributed without assets, which will need to be rebuilt.