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.
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.
mtPaint is a simple GTK+1/2 painting program designed for creating icons and pixel-based artwork. It can edit indexed palette or 24 bit RGB images and offers basic painting and palette manipulation tools. Its main file format is PNG, although it can also handle JPEG, GIF, TIFF, BMP, TGA, XPM, and XBM files.
class.upload.php manages file uploads for you. It manages the uploaded file and allows you to do whatever you want with the file as many times as you want. If the file is an image, you can convert and resize it, rotate it, crop it in many ways. You can also add borders, frames, bevels, text labels, and watermarks or apply graphic filters such as unsharp mask, contrast or brightness correction, colorization, negative, greyscale, reflections, and more. Security features and file management functions are provided. Flash uploaders and XMLHttpRequest uploads are supported. The class can also work on local files, is useful for batch processing, and can circumvent open_basedir restrictions. Files can be output directly to the browser. The error messages are internationalized, and translations provided. It is compatible with PHP 4 and 5.