Here's the demo client for Star Trek Online. Seek out new life and new civilizations in Cryptic's MMORPG based on Gene Roddenberry's sci-fi universe.
Boldly go where no man has gone before in the Star Trek Online demo, which features the complete tutorial as well as the episode 'Stranded in Space' with a mixture of away team and ship combat. The demo has unlimited play time. You will need to register a Cryptic account to play.