Engine_3D
A real-time 3D engine for DOS-talgics (see GLOBE_3D for new stuff !)
... sound driver, graphics driver, keyboard driver. The only things not in Ada there are the file system (MS-DOS), the 32-bit DOS extender (CWSDPMI) and the mouse driver.
For running, I recommend DOSBox.
For building from sources, you'll need the DJGPP compiler, which contains a version of GNAT - seems to be still updated as in June 2016 !
Mirror: https://github.com/zertovitch/engine-3d