syncpasswd is an Expect script that synchronizes passwords via SSH on multiple platforms (Linux/BSD, OS X, and Solaris). It takes hostnames as a list of arguments and changes the specified user passwords on those hosts. It outputs results to stdout and logs to /var/log/syncpasswd.log (by default).
GetMeDone is a task manager in the spirit of Getting Things Done. It uses PostgreSQL as a backend and is written in Tcl/Tk. Currently only tested on Linux, it should be easy to extend to run on Mac OS and Windows. It features easy filtering of contexts, priorities, and time, advanced recurrent tasks, linking tasks to projects, deadlines, an ideas list, and the ability to defer tasks to future dates.
tkccrypt is a small text file editor frontend for Peter Selinger's ccrypt written in basic Tcl/Tk. The program allows opening and storing only encrypted files, and it guarantees that the decrypted content is never written to disk. Its target audience is made up of users who don't feel confident using a console encryption tool, but need encryption for some text data. The dependency only on ccrypt and Tcl/Tk makes this program very easy to run on many Unix systems.
steelpoll is a Web polling application which allows you to quickly and easily create and manage polls by just editing plain Tcl files. A single poll can be created by editing the variables in a single file. You can optionally control votes by checking the user's IP address. A parsed vote log can be viewed. It doesn't require any SQL database backend because it stores the results in easily parsed plain text files. It doesn't use graphics to display poll results, which is great for text-based Web browsers.