Beam Screensaver
Beam Screensaver - is OpenGL-accelerated 3D screensaver for Windows 9x/ME/NT4/2000/XP. Dive into fantastic world of furious space battles. You will be amazed how absorbing and relaxing this OpenGL-accelerated screensaver is. Discover yourself in the middle of space action among asteroid belts... Enhance the impression from virtual journey with your favourite CD or MP3 music.
http://beamscreensaver.com/dl/beams173.zip - 2Mb - Download - Screenshot

#1 Enemy Detector for 3D Games
It gives you the ability to see through the walls and to discover your opponents long before you start shooting at each other. Thus you will gain a serious advantage by shooting your enemy through the wall or immediately after he comes out of the wall. ... The only requirement is your 3D game to use OpenGL rendering. ... Please make sure that the property 'Renderer', 'Driver' in the video options of your game is set to OpenGL. ... Enemy Detector works on all Windows systems. ... If you reach some very difficult stage of the game you can use our enemy detector to reveal and shoot your...
http://www.enemydetector3d.com/downloads/enemydetector3dsetup.exe - 468Kb - Download - Screenshot

Paraben's Mah-jong
Paraben's Mah-jong is an easy playing version of the classic game. Play it in English, French, German, or Spanish while listening to music. With features like "shadows" and "3D" play, the only challenge comes from the game itself. 3D play using your choice of DirectX 8. ... When you download and istall the demo version, you can choose to install all three versions (2D, 3D DirectX, 3D OpenGL). ... 1 or OpenGL. ... TGA tilesets and backgrounds. ... Try them all out to see which one works best on your system.
http://www.paraben.com/programs/pmahjong.exe - 1Mb - Download - Screenshot

Kikujiro
3D OpenGL version of Sokoban with 380 levels. Levels are made of blocs to push to specific places.
http://www.in-poculis.com/kikujiro.exe - 3Mb - Download - Screenshot

Pacman3D
Pacman3D game for fun! You can jump over walls. 20 levels. 3D OpenGL graphics. Very dynamic game.
http://www.coloritto.com/Pacman3DInst.exe - 1Mb - Download - Screenshot

Moraff MarbleJongg 2000
So you thought playing jongg style solitaire was too easy, no action huh?... Moraff's MarbleJongg is cutting edge code that utilises OpenGL for fast animation and screen refresh. Terrfic colors, great backgrounds. This freeware version has no time limit and is fully functional. ... Good 3D graphics card with acceleration and OpenGL driver is recomemnded for full effects but not required. ... Stores top ten best times. ... Comes with two tilesets and fourteen backgrounds - you can load your own backgrounds too.
http://www.moraff.com/downloads/marblejongg.exe - 6Mb - Download - Screenshot

Slot Machine
This is a 3d slot machine made with OpenGL and C++.
http://www.coolgroups.com/slotmachine3/slotsetup.exe - 1,001Kb - Download - Screenshot

Polygon Cruncher for 3D Photo Browser
Polygon Cruncher reduces the number of polygons of your objects without changing their appearance. You keep all details even at high optimization ratio. You also keep texture information, vertex colors. You can also optimized taking care of the symmetry of your objects. ... - An OpenGL preview which allows you to control optimization results. ... Polygon Cruncher has an OpenGL view which allows controlling optimization results whenever you want. ... - Respect of symmetry for objects that are symmetrical - You can protect the border of the objects.
http://www.mootools.com/plugins/download/3DPhotoBrowserPLY.exe - 8Mb - Download - Screenshot

Bananas In Space
A very cool 3D screensaver featuring bananas! Relax your mind as dozens of bananas elegantly spin and drift across the screen. Created in 3D using the power of OpenGL. Music playback is possible with the ability to launch any song or playlist from your computer. ... Let your inner monkey rejoice!
http://www.3dwonders.com/bananasinspace/BananasInSpaceSetup.exe - 732Kb - Download - Screenshot

Arkanoid 3D
We have already presented several Arcanoid clones. This one is the first made entirely in 3D setting! If you have OpenGL-compatible video card, such as 3dfx VooDoo 3, Riva 128, Riva TNT 1, 2 or any other, you are welcome to download and try Arcanoid 3D! ... This game is not only an exercise for your reaction, it is also a quiz for the spacial imagination.
http://www.alawar.com/Arkan3D.exe - 3Mb - Download - Screenshot