Qataki is a shell script that you can use to read/post notices from the command line in a simple manner. It supports Identi.ca, Twitter, and StatusNet. You can post, reply, retweet, or send direct messages; read personal, public, and user and group timelines (last statuses); read messages directed to you (i.e. where you are mentioned); read messages in context (conversations available only for Identi.ca/StatusNet); and search for notices.
gcp (Goffi's CoPier) is a command line file copying tool, loosely inspired by cp, but with high level functionality like a progress indicator, the ability to continue copying multiple files even when there is a problem with one of them, and the use of a journal to track successful copying. File names can be fixed to ensure compatibility with the target filesystem. If you launch a copy operation when another is already running, the files are added to the first queue to avoid hard drive thrashing. You can keep track of files you have copied, and re-copy them later. gcp is approximately option-compatible with cp.
Tiny Life (tlife) is a simple Game of Life implementation designed to work as a filter for the shell, operating solely through standard input and output, with an emphasis on shell integration rather than pretty visuals. It supports customizable output and board sizes, custom rulesets, and random and user-specified seed values for the starting generation.
hsh is a command-line driven user interface to your system with a full-screen curses interface instead of the scrolling terminal style output of traditional shells. The main purpose of hsh compared to a traditional shell is to make job output easier to work with. Each job's output is viewed and manipulated independently. This means, among other things, that you can incrementally create pipelines, and that a rampant process can't trash all the output of your session. Its syntax is designed for human use, not a programming language. It has a dynamic configurable interface, making useful information accessible.