Looking for good free tower defense games.

[east85]

I've been playing Spice Bandits and it's highly addictive. Just wondering if there's anything else out there I should look into in the same genre that's free.

I'm also open to RPG as long as it has an environment to explore and maybe some RTS games if there are any.

Thanks

 

[S.B.G]

GeoDefense and GeoDefense Swarm are still my favorites. Field Runners 1 & 2 are good also. I don't think their free though.