selector is a command line utility for dynamic string selection. As you type a list of substrings separated by ";" or a regexp, the display is updated in real time to show only the matching lines. The main usage of selector is as an efficient search in the shell command history. With the correct option, it will inject the selected line into the terminal input buffer, allowing the user to edit the line and execute it as a standard command.
prll is a utility for parallelizing the execution of shell functions. It provides a convenient interface for parallelizing the execution of a single task over multiple data files or any other kind of data that you can pass as a shell function argument. It is meant to make it simple to fully utilize a multicore/multiprocessor machine. prll is designed to be used not just in shell scripts, but also in interactive shells. To make the latter convenient, it is implemented as a shell function. Shells are not very good at automatic job management, so prll uses helper programs, written in C. To prevent race conditions, System V Message Queues are used to signal job completion. Standard output is buffered and Semaphores are used to prevent interleaving.
ptee is a Unix shell tool similar to tee, but it allows you to invoke multiple sub-shells in parallel. Standard input to ptee is copied to both normal standard output and to each sub-shell running under ptee. Each sub-command is run concurrently and fed the same input. The output of each sub-command is thrown away, but any shell expression can be used, such as redirecting to a file. Note that there are some limits on ptee. The shell pipeline will only execute at the pace of the slowest sub-command; otherwise large amounts of data would have to be buffered. Also, the shell that ptee invokes requires 'sh'-like semantics, such as supporting the -c option.
JCR Shell is a shell interface to manage JCR repositories like Apache Jackrabbit, Hippo CMS 7, and other JCR 1.0 (JSR 170) capable repositories. It uses RMI to communicate with the server. It features tab completion on names, types, and properties, the ability to import and export XML, a JCR diff tool, queries, reference lookups, and namespace management.
Pipa reads data from stdin and does various things with it: rotates by time interval / output file size; compresses it (gz, bz2, lzo, xz); names the output file with strftime(); splits it intelligently when given info about the file structure (newlines / PCAP); calls a user command on the finished output file; passes it to stdout (like tee); and more.
PirateWall is a simple Twitter Client. It displays search results for a certain keyword or hashtag in realtime in a shell-based environment. It can also be configured to act as a data provider for many different visualization tools. For example, it is possible to use the client as a text generator for many XScreensaver applications like "apple2" or "starwars". When used in a Unix shell environment, colorized output can be generated.