4 of 9Image
Boeing's CST-100 (Crew Space Transportation) is a large capsule capable of supporting up to 7-man crews and is designed to remain in orbit for up to 7 months at a time, and can be re-useable for up to 10 missions.The capsule is currently under preliminary development and has had mock-ups undergo parachute drop testing in the Nevada desert in April of 2012.NASA has leased space at the Orbiter Processing Facility in Kennedy Space Center for further manufacturing and tests of the CST-100.The CST-100 was designed to be compatible with several launch systems, including Atlas V, Delta 4, and SpaceX's Falcon 9.
MPCV (Multi-Purpose Crew Vehicle) is an outgrowth of the CEV (Crew Exploration Vehicle) of President George W. Bush's Vision for Space Exploration initiative that was announced in January of 2004. Various design changes have resulted in a capsule that can carry up to four astronauts, and is similar in outward appearance to the Apollo capsule from the 1960s.The Orion was originally designed to sit atop the Ares V booster system, which has since been cancelled by the Obama administration. Lockheed plans to do an initial unmanned flight test of the Orion using a Delta IV Heavy booster in 2014.
SpaceDev's Dream Chaser is an attempt to return to the X-34 lifting body designs originally proposed for the Air Force. Like the Space Shuttle, the Dream Chaser is a re-useable spacecraft which can accomodate a crew of seven astronauts and cargo for resupply of the ISS. It is designed to launch atop a Atlas V booster rocket and on its return trip earth, perform a glide (unpowered) landing on a conventional runway exactly like the Space Shuttle.NASA has awarded $80M to the continued development of Dream Chaser. Sierra Nevada has had successful test firings of the Dream Chaser's hybrid rocket motor and has completed tooling for building the composite structure of the vehicle, as well as assembly of the primary structure of its initial test flight airframe.No test flights have been planned as of yet.