Cannon Fodder is a retro action-strategy gem from 1993 that was originally released on my old love the Amiga, and the modern open source port just got upgraded. Open Fodder works with Cannon Fodder 1 and Cannon Fodder 2 which you need need the original data files to play it which you can grab from GOG.

The open source game engine adds in a number of enhancements to run it on modern PC platforms, and includes a random map system to play through too.