Astro Battle is a multiplayer network space simulation game where players can design, program and pilot their space ships against each other.
In the game players pilot space vehicles in an arena. The combatants must fight each other until one player reaches or exceeds a score of 100.

Additional info from the website:
"Membership is only $19.95 per year, free Guest accounts are available."

License: unknown (9.99 to 19.99)

Additional System Requirements: Java >=1.4 if using linux