Spacecraft under development

The proposed Crew Exploration Vehicle approaching the Moon

• Orion spacecraft
• Kliper - Russian ' Clipper '
• H-II Transfer Vehicle
• India Chandrayan-1 lunar probe
• CNES Mars Netlander
• James Webb Space Telescope (delayed)
• Kepler Mission Planet Searcher
• ESA Darwin probe
• Herschel Space Observatory
• Mars Science Laboratory rover
• Shenzhou spacecraft Cargo
• Terrestrial Planet Finder probe
• X-37
• SpaceX Dragon manned spacecraft
• System F6 - a DARPA Fractionated Spacecraft demonstrator

Unfunded/Cancelled spacecraft programs

Multi-stage

• Chinese Project 921-3 Shuttle
• ESA Hermes Shuttle
• Soviet Buran Shuttle
• Soyuz Kontakt
• Teledesic
• Manned Orbiting Laboratory
• X-20

SSTO

The First Test Flight of the Delta Clipper-Experimental Advanced (DC-XA)

• Skylon and the earlier RR/British Aerospace HOTOL
• ESA Hopper Orbiter
• McDonnell Douglas DC-X (Delta Clipper)
• Roton Rotored-Hybrid
• Lockheed-Martin VentureStar
• NX-Alpha (Planning Stage)

Sumber:
1. Wikipedia
2. http://astrophysicsblogs.blogspot.com/2008/09/25.html