Gxmessage opens a popup window to display a message obtained from the command line, from a file, or from stdin. The window includes a row of buttons, each of which causes the program to exit with a different return code. Because gxmessage is a drop-in alternative to xmessage, gxmessage accepts any option xmessage would, and returns the same exit codes.
Frams' Shell Tools is a big collection of various (mostly Perl) scripts to make Unix everyday life at the command line interface more comfortable. They have grown in the author's last 20 years as a Unix user, programmer, and administrator. Some examples are: clp (Command Line Perl: a Perl "shell"), fpg (Frams' Perl grep: a grep with full Perl support), zz (generic clipboard), and nvt (Network Virtual Terminal: a better telnet for scripting).
galculator is a GTK 2/GTK 3-based scientific calculator supporting algebraic mode, RPN, and formula entry mode. Features include arithmetic operations plus precedence handling, full keypad support, trigonometric functions, power, square root, natural and common logarithm, constants (e, PI), and inverse and hyperbolic functions. It supports different number bases (decimal, hexadecimal, octal, and binary) and angle bases (radiant, degree, and grad).
Socat is a relay for bidirectional data transfer between two independent data channels. Each of these data channels may be a file, pipe, device (terminal or modem, etc.), socket (Unix, IP4, IP6 - raw, UDP, TCP), SSL, a client for SOCKS4, or proxy CONNECT. It supports broadcasts and multicasts, abstract Unix sockets, Linux tun/tap, GNU readline, and PTYs. It provides forking, logging, and dumping and different modes for interprocess communication. Many options are available for tuning socat and its channels. Socat can be used, for example, as a TCP relay (one-shot or daemon), as a daemon-based socksifier, as a shell interface to Unix sockets, as an IP6 relay, or for redirecting TCP-oriented programs to a serial line.
dvtm brings the concept of tiling window management, popularized by X11-window managers like dwm, to the console. As a console window manager, it tries to make it easy to work with multiple console based programs like vim, mutt, cmus, or irssi. dvtm is intended to be used where X11 isn't available or over SSH. In conjunction with dtach, it can be seen as a lightweight alternative to GNU screen.
RCSSmin is a CSS minifier. The implementation is based on the semantics of the YUI compressor, but aiming for speed instead of maximum compression so that it can be used at runtime rather than during a preprocessing step. rCSSmin does syntactical compression only (removing spaces, comments, and possibly semicolons). It does not provide semantic compression (like removing empty blocks, collapsing redundant properties etc). It does, however, support various CSS hacks (by keeping them working as intended).