xdata implements an interface to arbitrary key-value pairs which are accessible to simple shell and Perl programs. Applications for this include to-do lists, contact databases, browser bookmarks, and anything else which requires small pieces of data to be referenced by keys. xdata stores timestamps for the data it manages, and comes with a program to synchronise databases among cooperating hosts. This allows you to propagate information among hosts in a transparent fashion (creations, updates, and deletes are correctly handled). xdata consists of a set of shell-level utilities and a Perl module.
xtctl is a script for setting/changing xterm properties. It can change the foreground, background, cursor, and mouse colours of an XTerm window, and the icon and background image (only known to work with Eterm). xtctl can also modify the window's title, icon name, highlight background, font, size, position, z-order (raise and lower), and iconified/restored status. There are experimental options for full and soft reset.
Yessh is a bash program that uses the SSH client. It provides fast connections to Linux/Unix hosts. Just type the name you have chosen for a host, and yessh will connect you via SSH. You don't need to remember the IP address, hostname, login, or password; just one arbitrary name. Accounts with passwords are kept in a secure file where passwords are encrypted using OpenSSL with 128-bit AES. You can use the autoconnect function to connect to your server with 5 keypresses.
Yruba provides a rule system similar to make or ant for the shell (bash). It provides a clear separation between a list of dependencies that must be up-to-date before the current task can be performed, an explicit test that checks whether the target is really out-of-date, and a command that finally makes the target. Everything is plain bash syntax, so there is no new command language to learn.