The best place to go for my group's software that is open source is github: WING.NUS @ GitHub.

Visit WING NUS GitHub »

As I run a research group, I don't do so much software development myself, but you can find some small projects on my own GitHub account, knmnyn @ GitHub. Most of what I've done professionally for natural language processing during my Ph.D. years is available from the Columbia NLP group's home page. This includes the verber, centrifuser and segmenter packages.

Besides that:

• Automated grading script. A perl script to automatically tabulate homework grades and mail students their results.
• A small script that reads some macros in LaTeX and converts them to an indented textual format. Useful for translating LaTeX or Tex to MS Powerpoint (.ppt). My best solution to the tex2ppt problem. Use this file to translate the LaTeX to plain, indented TeX and then import the file as an outline in PowerPoint (Insert → Slides from Outline). I used this as a starting point for editing slides for the Artificial Intelligence: A Modern Approach textbook by Stuart Russell and Peter Norvig.
• LaTeX / TeX word counting perl script. Counts word in the {document} tag or the entire document (with a flag). Gives section, subsection, subsubsection word counts. Can automatically update a special section in your document with the word counts found. Updated in 2007, 2008, 2009 by Sam Tygier <sam@tygier.com.uk>, Gregor Heinrich and Martin Magnusson <martin.magnusson@oru.se> and Edward Vigmond to process other inputs included by the \input and \include tag, to process books and reports with \chapter level headers, and deal with running headers, and words in captions, respectively.
  Best to try the home page and demo at http://wing.comp.nus.edu.sg/~min/texWordCount/.
• Template perl script. Useful for building new perl scripts from.
• Another template script for ruby.
• Need help with LaTeX? Hypertext help is a good site that I use all the time. I've mirrored it here.