Plug-in hybrid
Prius+ (also written Prius Plus) became the open-source standard on which most plug-in hybrid kits were based. Plug-in hybrid kit manufacturers included: A123 Hymotion, Amberjac Systems, based on EDrive Systems emerged from the original EnergyCS, EETrex, Enginer, Hybrid Electric Vehicle Technologies, Plug-In Conversions Corp, Plug-In Supply (still operating), MD-Tech