OpenPort 1.3M for Mitsubishi vehicles
The OpenPort 1.3M is an USB device that interfaces between your PC and car engine computers (ECUs) that use a ISO 9141-2 compatible OBDII interface. It also contains special hardware and connectors to allow it reprogram (reflash) most modern (1996+) Mitsubishi ECUs.
That depends on your car and the software available. Although the cable itself can potentially communicate with any car that has an ISO 9141-2 type OBDII interface, you are limited by what software supports your vehicle and the cable. The efforts at openecu.org so far have been focused on datalogging and reflashing of newer Subaru and Mitsubishi vehicles.
Most all post-1996 Chrysler, European, and Asian vehicles.
Check the EcuFlash vehicle support wiki page at openecu.org.
Drivers are automatically installed when you install EcuFlash.
A list of downloads can be found at openecu.org