GNotary is a set of Python scripts that implement an asynchronous digital notary service. Anybody who needs certification of any digital document creates a message digest (like MD5 or RIPEMD160) of that document and submits it to the GNotary service by email. GNotary signs this email digitally (using GnuPG), retains a copy of the certified and time stamped message, and mails it back to the sender, optionally with the public key attached to allow the sender to verify the signed document. At regular intervals, the GNotary server creates message digests of its own logs and distributes them among other GNotary servers, thus making it virtually impossible to forge the chain of evidence that authenticates a submitted document.
APLM (Alex Personal Library Manager) is a set of Perl scripts for managing a small library. It is designed to be easy to set up, easy to use, very customizable, and self-contained. It lets you type in your books, change a few paths, and get going without worrying about MySQL or anything. It also has a Web interface.
xremote is a simple tool that lets you grab the mouse and keyboard of another machine and control them with your local mouse and keyboard. It creates a form of remote control of other machines. All mouse- and keyboard-actions on the local machine are forwarded to the remote display.
GLeave, short for Graham's Leave, is an evolving Perl clone of the Berkeley leave program that was written in C. gleave reminds you when you have to leave. gleave waits until the specified time, then reminds you that you have to leave. You are reminded 5 minutes and 1 minute before the actual time, at the time, and every minute thereafter for 10 minutes.
MRML for KDE is a KDE MRML client which offers integration of content-based queries into Konqueror/KDE. It consists of a KPart (which could be embedded into Konqueror for example) and a kio-slave for communication with the MRML server. You can right-click on an image and choose "Search for similar images..." in the context-menu, which will perform a query on a server and present you a thumbnail view of the results. You can also refine queries by giving relevance feedback.
RCXDatalog is a GUI-based Unix tool to interact with the Lego Mindstorms RCX brick. Using RCXDatalog, you can upload the datalog of the RCX and display it on your screen or print it to a PostScript printer. It also includes some additional widgets to show light and touch sensor readings of the RCX.