SpaceTrek: The new Empire is playable without download directly over the Internet free of charge.
In order to be able to play in STNE, you must only register.If you'd like to take a look at the game, you can use the guest account:

Guest account

Registration information
Language:	DeutschEnglish
Select Server:
Server 1 (english) - 2843 players
Nickname (3-32 letters)
Password:
Confirm password:
E-Mail:
Confirm email:
I accept the [Rules]
Please enter the security code:
Where did you hear of SpaceTrek: The New Empire?
Source