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FlightGear is an open-source flight simulator.  It supports a variety of popular platforms (Windows, Mac, Linux, etc.) and is developed by skilled volunteers from around the world. 

FlightGear is an open-source project. This means as long as you abide by the terms of the GPL license you may freely download and copy FlightGear. 

Extensive and Accurate World Scenery Data Base

• Over 20,000 real world airports included in the full scenery set.
• Correct runway markings and placement, correct runway and approach lighting.
• Taxiways available for many larger airports (even including the green center line lights when appropriate.)
• Sloping runways (runways change elevation like they usually do in real life.)
• Directional airport lighting that smoothly changes intensity as your relative view direction changes.
• World scenery fits on 3 DVD’s. (I’m not sure that’s a feature or a problem!) But it means we have pretty detailed coverage of the entire world.
• Accurate terrain worldwide, based on the most recently released SRTM terrain data.) 3 arc second resolution (about 90m post spacing) for North and South America, Europe, Asia, Africa, and Australia.
• Scenery includes all vmap0 lakes, rivers, roads, railroads, cities, towns, land cover, etc.
• Nice scenery night lighting with ground lighting concentrated in urban areas (based on real maps) and headlights visible on major highways. This allows for realistic night VFR flying with the ability to spot towns and cities and follow roads.
• Scenery tiles are paged (loaded/unloaded) in a separate thread to minimize the frame rate hit when you need to load new areas.

Do you like old school deathmatch with modern features? How about rich, colorful, arcadelike atmospheres? How about...retro Sci Fi? Then you're going to love what Alien Arena has in store for you! This game combines some of the very best aspects of such games as Quake III and Unreal Tournament and wraps them up with a retro alien theme, while adding tons of original ideas to make the game quite unique.

Alien Arena is a furious frag fest with arenas ranging from the small, to the massive. With a large built-in player base, it's never hard to find a good match going on, at any hour of the day. The community is friendly, as well as prolific. Dozens of maps, models, and various accessories have been created by community members to add on to the game experience. The CRX engine that powers Alien Arena has received very signifigant upgrades in recent releases, resulting
not only in stunning new visuals, but vastly increased performance as well.

Single and multiplayer!

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