Construo is a simple 2D construction programm (it is currently not a real game) for objects which consist of rods and springs and let them react on physical forces. You can currently construct buildings and objects like bridges, towers, spaceshuttles, etc. and you let them fall to ground and see seem smash and break. Sound like fun, doesn't it =;-)
The game is similar to Bridge Builder and heavily inspired from the Gamasutra article Collision Response: Bouncy, Trouncy, Fun. Its covered under the GNU General Public License, thats means source code is availabel and you are allowed to modify it.
The 'thing' is currently useable for constructing simple 2D objects, but there is really quite a lot stuff missing. There is currently no way to set different parameters for rods or springs, change their color or thikness. Building with prefabs could also be fun. Colliding rods would also be a usefull feature, currently only rod-ground collision is implemented. See the file TODO in the source directory contains a few more infos.
The versions up from 0.1.0 only require Xlib or Glut, which comes with every GNU/Linux and should be available an almost all systems, so you shouldn't have problems compiling it. Binary version for 0.2.0 aren't planed, but can be provided if anybody has throuble compiling themself.