At the end of 2008, I started to learn MAXScript, the scripting language that comes with 3D Studio Max. Thus, my first "real" script was only for learning purposes.
"Rotate!" is a very small script that takes one slider and at least one object and wires the object's rotation with the slider's value. When I wrote this tool I had the boring process of rigging fingers in mind. Download it here.
A tool for personal use is the "NDS Exporter Tool". It aids me with my current ambitions to create some homebrew for the NDS and could be described as an automatted pipeline which generates binary files and uses extern executables to make chosen 3D models usable on the NDS and emulators. It is currently not available for download as it still is in development.
For the company where I worked as an intern I programmed three small scripts. They are helpers for customers of the plugins Unwrella or Flatiron, or for users of FinalRender. You can download the scripts on 3d-plugin.com.
The "Unwrella 2 Helper", also called "UV Seams to UV Edges", is a very small script that transforms the selected blue edges in an Unwrap UVW modifier into green seams.
The "FinalRender Material Converter" can automatically change every standard material into an fR-Advanced material - or vice versa.
And the "SlotSwapper" swaps two slots of two materials. Helpful if you rendered a lightmap into the wrong material slot.