A is for the Atavachron, the sophisticated time portal and computer system of the late planet Sarpeidon.
B is for Bussard Collectors
C is for Captain's Yacht, a private, warp-capable pleasure and luxury craft attached to some Federation starships in the late 24th century.
D is for Dunsel.
E is for Energy Shielding, commonplace on what seems like most of the known galaxy's larger spaceships.
F is for Food Replicators
G is for Graviton emitters
H is for Hypospray