ACE - Amiga C Engine
Game engine written totally in C for classic Amiga hardware. Lightweight, flexible and hackable. Coded mostly for bare HW, OS function usage is receeding. Nonetheless code is OS-friendly, allowing running from and exiting to Workbench gracefully.
Current feature set is OCS-oriented, although produced code should work on AGA just fine.
For build instructions basic how to and contributing guidelines, refer to docs.