Free cheat planet software for linux

Planets is a simple interactive program for playing with simulations of planetary systems, released under the GPL. The project runs on Linux and Windows, and could doubtless be ported to your favorite flavor of Unix.
Planets was originally designed for kids, in particular, for my then 4-year old nephew who is fascinated by astronomy. The user interface is aimed at being simple enough that a fairly young kid can get some joy out of it. But the adults who have used it have found it to be pretty fun as well.
The code is not bug-free, and Planets is missing some significant features. But its pretty stable and is a fun toy to play with. If you do download it, please drop me an email and tell me about your experience with it.
Main features:
- Saving and loading of universes
- Infinite undo (erase last action) and goback (return to point in time just after last action). This allows for undoing mistakes and replaying interesting configurations.
- Traces of planet trajectories
- Two ways of dealing with planet collisions:
- merges, where the colliding planets are merged into one planet, and
- bounces, where the colliding planets are bounced off each other elastically. This itself comes in two varieties:
- force bouncing, where the force between planets is made repulsive at close quarters.
- true bouncing, where simple pool-table physics calculations are made to determine when planets collide, and compute the appropriate bounce from said collision.
- kidmode, a mode where the focus is (mostly) locked on the application, and interesting changes are initiated by merely banging on the keyboard. This mode is aimed at 1-5 year olds.
- Center-of-mass following: it is possible to follow the center of mass of a subset of the planets. Thus, if you have a sun-moon-planet system, you can have the view automatically track the moon-planet pair.
- Can display kinetic, potential and total energy of the system.
- Both the gravitational constant and the gravitational exponent can be changed.
- There is a simple control panel that makes it possible to see and change the simulation options.
- Zooming, panning, and centering on the center of mass.

The purpose of Planets 3D is to show a simulation of our solar system. The focus lies on a nice graphic (3D OpenGL) and the possibility to modify the objects of the solar system to see what happens.
This program is written on Linux using C++. In theory it should be portable to windows, because Ive used only plattform independent libraries. Anyone who tries to port it please contact me even if unsuccessful, perhaps I can help overcome arising errors.
By now there is included a small program which converts different coordinate systems into each other. It is called Astroconvert.
Main features:
- simulate the development of the solar system based on calculations of the gravity power
- take screenshots
- load and save solar systems
- modify solarsystem
- switch between different cameras to view the solar system (e.g. look through a shuttle window)

The Ark Roleplaying Kernel project is a 3D multiplayer roleplaying engine.

The Ark Roleplaying Kernel is a roleplaying engine that will allow game developers to create a full- featured role playing game, without having to write a single line of C++. All they have to do is to create game data (models, textures, world), and define the behaviour NPCs, in Lua. The engine contains a full outdoor 3D engine, with support for skeletal animation, and triangle- accurate collision detection. It also contains tools to create world and quests, and loaders for the most common low-polygon 3D formats.

After an never-ending war which had begun because of the arrival of the daphyrings (insect-like creatures) which some humans feared, the planet sank bit by bit into a Middle-Age-like ignorance. From the bits of a rich and united nation were born numerous empires ever waging war between themselves. Humans having forgotten all their knowledge use the seldom-found devices of the ancient civilization such as magical artifacts, for they now know only how to forge old-fashioned weapons such as swords, axes, bows...

Fauna and flora themselves have been modified, because of the cataclysms (nuclear incidents) which occurred during the Great War. These accidents have also divided humans into many clans yet having a common religion. It is in this world, named Arkhart, that the game named for the moment ArkhartRPG (ah, such originality!) takes place.