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Common oxidizers include gaseous or liquid oxygen and nitrous oxide.
The Reaction Research Society (RRS), although known primarily for their work with liquid rocket propulsion, has a long history of research and development with hybrid rocket propulsion.
Several universities have recently experimented with hybrid rockets. BYU, the University of Utah and Utah State University launched a student-designed rocket called Unity IV in 1995 which burned the solid fuel Hydroxy-terminated polybutadiene (HTPB) with an oxidizer of gaseous oxygen, and in 2003 launched a larger version which burned HTPB with nitrous oxide.
Portland State University also launched several hybrid rockets in the early 2000's.
SpaceShipOne, the first private manned spacecraft, is powered by a hybrid rocket burning HTPB with nitrous oxide. The hybrid rocket engine was manufactured by SpaceDev. SpaceDev partially based its motors on experimental data collected from the testing of AMROC's ( American Rocket Company ) motors at NASA's Stennis Space Center's E1 test stand. Motors ranging from as small as 1000 lb to as large as 250,000 lb thrust were successfully tested. SpaceDev purchased AMROCs assets after the company was shut down for lack of funding.