Trash Can is a recycle bin implementation for the command line. It is a set of scripts that can be run with ksh, bash, or zsh. It has commands for file removal, file restoration (to the original path), permanent deletion of particular files from the trash can, automatic purging of trash that is more than a certain number of days old, completely emptying the trash can, configuring trash can storage capacity, and displaying trash can disk usage. Trash is compressed to take up less room.
rlimit is a program that lets you run processes with system resource limits set. It can be used by software developers and testers to test that software will run correctly in resource restricted environments. It is also useful for software which would otherwise consume excessive resources such as programs that used 100% CPU, set their own priority levels, or consume too much memory. This is basically a command line interface to the system functions getrlimit() and setrlimit().
fnf is a script that provides a list of a Twitter user's friends and followers. If you provide a username (and optional proxy), fnf will generate two files: USERNAME.followers and USERNAME.friends, consisting of a list of Twitter screen names and real names separated by " :: ". This data is easily used in scripts or imported to spreadsheets.
phpdocr will download, prettify, and output PHP documentation for the function or class that is supplied on the command-line, much like perldoc does for Perl and ri does for Ruby. Unless you explicitly tell it not to, phpdocr will also cache the documentation locally for fast retrieval in the future.
SQL Tagger reads the tags of audio files from a directory, loads them into a temporary SQLite database, accepts SQL queries to modify this database, then saves any changes back to the audio files. It's useful for performing complex updates that would be difficult or tedious with conventional taggers. It's a complement to conventional taggers, not a replacement.