Freshmeat page: http://freshmeat.net/projects/bashcompletion/
As most users know, using standard bash completion, you can complete commands on the name of executables and files. However, since v2.04 of bash, programmable completion of the shell is possible. Using this facility, it's possible to intelligently construct complex command lines using very few keystrokes. Some examples:
This would complete on a list of hosts drawn from your ~/.ssh/known_hosts file.
This would complete on a list of exported filesystems from host host.
This would complete on a list of available targets in Makefile.
This would complete on a list of all man pages that start with str in section 3 of the manual.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!