Farscape-1 is John Crichton's space module that was originally designed to be able to survive high acceleration from a gravitational slingshot about the Earth. Crichton arrived in the Uncharted Territories via this craft, after accidentally traveling through a wormhole from Earth. Though Farscape-1 is considered relatively primitive by the standards of the other races Crichton has encountered, it is somehow able to navigate wormholes where some other, more sophisticated craft, notably Peacekeeper Prowlers, cannot without liquifying passengers.
Although originally equipped for one passenger, a second seat was added.
John has extensively modified his module using organic parts from Moya so that it can now use various alternate fuels. This has allowed it to achieve speeds that were not possible before its modification.
The name of the show comes from part of this craft's name.