Megasquirt.
http://groups.yahoo.com/group/megasquirt
A very
serious DIY setup. You have to provide manifolding, throttle body, injectors, yadda yadda yadda. MS is an ECU board that you put together yourself. Source code for the program running on the board is downloadable and modifiable.
Mueller has one on his 914. Using mostly 2.0 FI hardware, as I recall. Still needs tuning...
--DD