Libglade is a small library that allows a program to load its user interface from an XML description at runtime. The XML file format is that of the user interface builder GLADE, so libglade acts as an alternative to GLADE's code generation approach. Libglade also provides a simple interface for connecting handlers to the various signals in the interface (on platforms where the gmodule library works correctly, it is possible to connect all the handlers with a single function call). Once the interface has been instantiated, libglade gives no overhead, so other than the initial interface loading time (which is short), there is no performance tradeoff.
Libxml2 is the XML C library developed for the Gnome project. The library code is portable (to Linux, Unix, Windows, embedded systems, etc.) and modular; most of the extensions can be compiled out. Libxml2 implements a number of existing standards related to markup languages, including the XML standard, Namespaces in XML, XML Base, Relax NG, RFC 2396, XPath, XPointer, HTML4, XInclude, SGML Catalogs, and XML Catalogs. In most cases, libxml tries to implement the specifications in a relatively strict way. To some extent, it provides support for the following specifications, but doesn't claim to implement them: DOM, FTP client, HTTP client, and SAX2. Support for W3C XML Schemas is in progress. It includes xmllint, a command line XML validator.
mailq_applet is a GNOME 1 panel applet that shows the status of your outgoing mail queue. It's intended for dialup users who may connect, wait for the queue to drain, then disconnect. Having this on your panel is much more convenient than running mailq over and over again from a terminal. It works with Exim and Sendmail. If you use a different MTA, you may need to make some changes, but the code is so trivial that that shouldn't be difficult. This code is no longer used or maintained by its author.
matritsa is a computer version of a board game for kids. The goal is to take cards out of a deck of cards and put them on a board so that they match different properties of the rows and the columns. It comes with a game with the goal of matching the number of red balls of the column and the number of green balls of the row. The game provides a very simple method of adding your own cards.