A planetarium software that shows a 3D simulation of the night sky
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets, nebulae and others things like ground, landscape, atmosphere, etc.
A free transportation simulator game
Simutrans is a cross-platform simulation game where players try to successfully manage transportation systems between places by land, air, and water for passengers, mail, and goods. Planes, ships, trains, trams, trucks, buses, or monorails are at your disposal, but factories operate based on contracts and passengers can only travel to their set destinations.
SpeedSim is an OGame (ogame.org) combat simulator. It has lots of additional features like BestWorst-Case calculation, multiple simulations, it supports skinning and other useful things. This is also the project page of QtSim (SpeedSim for Linux)
We have moved to GitHub! github.com/TheAirlineProject
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OpenTTD is an open source clone of the Microprose game "Transport Tycoon Deluxe". For more recent versions visit our website: http://www.openttd.org
VR Flight Simulator with real world scenery and new aircraft
Cosmosair Flight Simulator (Cosmosair FS) is the next generation virtual reality (VR) flight simulator aimed mainly at x64bit computer systems (MacOSX, Windows, Linux) that integrates a 360º Degrees VR Engine. It comes packed with first-class Up-to-Date World Scenery and State-of-the-Art 3D Aircraft Models. It allows you to fly into Space and back to the Earth seamlessly. You can fly to Mars within it's atmosphere and explore it's landscape... or even fly and land on the Moon. You can perform orbital space flights near our earth or in far planets. With Cosmosair FS you can become a better pilot flying commercial airliners or military aircraft. You can do pre-established missions, set your own missions or discover the solar Sytem planet by planet with NASA's Shuttle or SciFi Spacecraft. Cosmosair FS comes packed with top-notch features that sets it apart from it's counterpart flight simulators. CosmosairFS is under active development and will be soon unveiled.
Java version of Stellarium.