High Quality Content by WIKIPEDIA articles! Hybrid Synergy Drive (HSD) is a set of hybrid car technologies developed by Toyota and used in the company`s Auris, Prius, Highlander Hybrid, Camry Hybrid, Estima, Alphard, Lexus CT, Lexus RX 400h/RX 450h, Lexus GS 450h, Lexus LS 600h/LS 600hL, and Lexus HS 250h automobiles. Toyota also licenses its HSD technology to Nissan for use in that company`s Nissan Altima Hybrid. Its parts supplier Aisin Seiki Co. sells similar hybrid transmissions to other car companies.