Speeduino is growing all the time and new features are added regularly.
Here's some of the main ones though
Support for 1-8 cylinder engines
Fully interpolated 16x16 Maps
Open and closed loop boost control
Extensive list of supported crank patterns
Detailed and high speed logging
VE Analyze Live ('Autotune')
Secondary map switching
Individual fuel cylinder trim
Over dwell and over duty protection
Launch control
Free calibration of all sensors
Flex fuel support