Some more or less useful tools I found along the web or made myself.
  

3D Tools

3D-Analyze by Tommti Systems
Its a program to presetup you D3D games with a lot of intressting functions.
Filesize is 0.65 Mb
D3D Windower by menopem
Its a program enforces D3D rendering aplications to run inside a window.
Filesize is 0.41 Mb
3D Ripper by denull
Its a program that catches the current frame and exports it. It also can enforce windowed mode.
Filesize is 0.42 Mb
3D Ripper DX by Roman Lut
Its a program that catches the current frame and exports it for 3d Max or Maja. It also can enforce windowed mode.
Filesize is 1.40 Mb
GL Intercept 0.5 by Damian Trebilco
Its a program that catches the current frame and exports it for Open GL. It also can enforce windowed mode.
Filesize is 0.74 Mb
  

Converter

My MS-Dos Box basing Imperial to Meteric units converter.
Filesize is 24 kb
My MS-Dos Box basing Imperial to Meteric units converter.
Filesize is 14 kb