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.
Jaikoz is a powerful tag editor that allows you to organize, edit, and correct thousands of audio tags with ease. Jaikoz has powerful automation features. Jaikoz uses MusicBrainz and MusicIP, online databases of over 5 million songs, which can match your songs automtically based on the actual music as well as the metadata. Jaikoz uses a convenient spreadsheet view to allow you to edit information very quickly and provides many autoformatting tasks which do most of the work for you.
Tux Paint is a simple and entertaining drawing program geared towards young children. It has a simple interface, sound effects, and a cartoon character (Tux, the Linux penguin). Along with drawing brush strokes, lines and shapes, you can also enter text and place "rubber stamp" (or "sticker") images on the picture. Tux Paint is extensible, and could be useful in an educational environment (such as a grammar, elementary, or grade school). It's portable across numerous platforms, and runs well even on slower systems like the Pentium 133MHz.