Open Source OBD software


 * JDash http://jdash.ludicrous-speed.com/wiki/index.php?title=Main_Page
 * Opendiag simple OBD-II to RS232 cable and information about Volkswagen-specific extensions.
 * Freediag open source software that works with six different cables.
 * the classic "Jeff" interface OBD-II <-> RS232
 * scantool.net interface vendor offers source code for Windows that is also reported to work in Linux under Wine. How to use the software
 * Design News article on improving fuel efficiency includes an OBD-II interface circuit and a discussion of how fuel efficiency can be calculated from airflow and vehicle speed.
 * obddig.net offers a schematic, software, and a kit for a PIC-based computer interface.
 * Serial interface OBD II or KL to RS232 with cheap IC MC33290 (schematic and PCB; German, translated with babelfish)
 * USB Port interface OBD II or KKL to USB with cheap ISO IC L9637 (schematic; German, translated with babelfish)
 * RomRaider ROM editor/ECU logger for Subarus