The NIRVANA Engine is a 'bicolour' (multicolour 8×2) graphics engine written by Einar Saukas, supporting graphics using 22 character rows and 30 character columns. It's open source and royalty-free (even for commercial programs). Further details can be found in this thread. The latest version is available for download here.
List of released games using the NIRVANA Engine:
- DreamWalker: Alter Ego 2 by Denis Grachev
- El Stompo by Dave "R-Tape" Hughes
- Sun Bucket by Dave "R-Tape" Hughes
List of games currently under development: