Godpower

An old style Shockwave game, a homage to Space Invaders.
http://www.godpower.de/

Rumsfeld Invaders

Rumsfeld, the US Secretary of Defense, is waging war. Fire missiles at him and avoid being hit by bombs in this Atari-style Flash-based game.
http://www.rumsfeldinvaders.com/

Park Power

Shockwave Space Invaders type game with a Soccer (Park Football) theme.
http://www.parkpower.com/

Clown Invaders

Shoot all the clowns in this Shockwave version of the arcade game Space Invaders.
http://www.ihateclowns.com/clowninvaders.php

Javaders

Variation of Space Invaders game in Java. Includes five levels and four difficulty settings.
http://www.cix.co.uk/~toyne/javaders/