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Really nice game engine that just renders earth from space to find details on the ground, with a mix of streaming height data and procedural generated objects: Flying around Outerra's Anteworld is an amazing experience

Similar to the Minecraft model, you can buy the (pre)alpha now for $15 and get all updates later for free, while the price will rise:

Download is just 219 MB, pretty fast via torrent.
Jörn Zaefferer's profile photo
The "oh look, now we're in space" effect is amazing.
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