KAlarm lets you schedule personal messages to display, audio files to play, commands to execute, or emails to send. Among its options, it allows you to choose the message font and color, recurrence schedule, whether to display an advance reminder, whether to speak the message or play a sound when it is displayed, and whether to cancel the alarm if it can't be triggered on time (e.g. if you are logged out at the time). As well as using the graphical interface to configure alarms, you can use the command line, and there is a D-Bus/DCOP interface for other applications.
MuseScore lets you notate and compose music easily with your keyboard, your mouse, or a MIDI keyboard. You can print beautifully engraved sheet music or export it as PDF or PNG. You can play your score, transpose it, and save it as audio or MIDI file. MuseScore also supports MusicXML to let you share your composition with other scorewriters. MuseScore is often advertised as a cost effective alternative for Sibelius and Finale.
SpeechControl provides speech recognition for Linux. It allows you to train and build archives of your voice so it can understand you with precision, can install standard models and adapt the model to reduce the amount of work you'd have to do and have a wider range of accuracy, and can share your training information with the online repository VoxForge.
LIME is a dynamic programming language with a LISP-like syntax. It features partial function application, eager and lazy evaluation, call-by-value and call-by-reference, macros, reading/writing LIME code as data, a standard library including infinite streams, and an interactive mode with auto-indentation.
ISP-fW is a firewall script which provides port forwarding, packet filtering, stateful packet inspection, port redirection, masquerading, SNAT/ DNAT, TOS, and generation of htb rules for bandwidth management. It includes a Web interface for easy access. It's useful for ISPs which want to separate National traffic from International traffic.