S3DTK is a unit for Free Pascal and Delphi that provides bindings to the S3D API, used by the S3 Virge family of GPUs. The unit has been tested with Free Pascal 2.2.4 (the last version of Free Pascal to support Windows 95 out of the box) and Delphi 2 (though for Delphi i only tested that the unit compiles - to actually use the unit you need DirectDraw support and i do not know of some bindings that work with it - there are DirectX bindings for Delphi 4 and later however, so at least the unit should be useful for those).
I wrote this unit mainly in the interest of retrocoding - my main PC during the late 90s and early 2000s had an S3 Virge with a Pentium MMX and at the time i wasn't even sure if the card actually supported 3D rendering. Turns out it did, but it took a while to figure that out.