synaptiks is a KDE touchpad tool consisting of a system settings module for touchpad configuration and a tray application for touchpad management. The system settings module allows you to configure basic as well as advanced touchpad settings. The tray application can switch your touchpad on or off, either manually using a global shortcut, or automatically, if external mice are plugged or while the keyboard is active.
sync2cd is an incremental archiving tool. It allows backing up complete filesystem hierarchies to multiple backup media (e.g. CD-R). Files are archived incrementally, i.e. only new or changed files are stored during an archive operation. All entity types are supported: directories, files, symlinks, named pipes, sockets, and block and character devices.
synctool is a cluster administration tool that keeps configuration files synchronized across all nodes in a cluster. Nodes may be part of a logical group or class, in which case they need a particular subset of configuration files. synctool can restart daemons when needed, if their relevant configuration files have been changed. synctool can also be used to do patch management or other system administrative tasks.
tag-not-ed is a system that allows you to create and manage text documents by attaching tags to them. Later, documents can be retrieved by running queries on those tags (e.g., "show me all docs that deal with 'dogs' and 'cats'"). It is composed of a front-end (currently a mode for the jed text editor) and an indexer. The latter can be used to implement a rudimentary "tagging file system".
TaylorType is a program that speeds up the creation of LaTeX documents. It will compile any LaTeX document you give it with a single click. The emphasis is on a very lightweight and simple GUI. The only interaction happens in the system tray, with two file selectors and a checkbox.