Mostly OBDII-compliant scantool and diagnostic software
o3DIAG – A Open Source OBD-II Diagnostic Tool for Windows and Linux
configurable OBDII diagnostics software
A Perl program for logging OBD-II PID data
ELM327 canbus utilities
Mobile APP to show car info
XBMC OBD2 Plugin
Simple OBD2 DTC reader (Linux and Win32)
Arduino based open-source car gauge and HUD