PSC (Perl Secure Conf) is a setuid wrapper and Perl module for securely passing configuration data to Perl scripts, especially DBI passwords etc. The wrapper opens a conf file, drops priviledge, and then execs the Perl script, leaving the filehandle available to the Perl script for reading (and writing, if allowed). Config::Secure is a module (available on CPAN as well) that initializes, and optionally parses the config file. Please note this is still vera alpha, yet seems to work smoothly.
PHP Mobile Mail is aimed at mobile professionals who want to use their favorite MUAs (noteably pine or mutt) on their laptop, either in UNIX or Windows (under GNU Gygwin). This lets you work offline. It includes a mail_spooler program, which accepts the output of you MUA and spools (on, or offline). When connected, another process parses through the spool and sends your messages. It is also designed to "fake" using your REAL email address with free services like gmx.net, or mail.yahoo.com, when using their POP and SMTP servers, assuming you have a domain and account that you can control to this degree.
Umbrello UML Modeller is a Unified Modelling Language diagram tool for KDE. It is able to produce all types of UML diagrams. It imports C++, and it generates code in 10 languages. It uses an XMI-based file format. It is part of KDE, with sources and packages available for those using older versions of KDE.
Robocode is a fun programming game that teaches Java by letting you create Java Robots, real Java objects that battle it out onscreen against other robots. Robocode is similar to a combination of Logo and CoreWars. While playing Robocode, you will learn how to write Java code, how to handle events, how to create inner classes, and more.