Thumbpad is a simple note taking program, which displays a very large keyboard that you can easily type on using only one finger. So, if you're holding your PDA with one hand, you can use your thumb. The default keyboard provides the 16 most commonly used keys (in English), and two other layouts provide the remaining letters, numbers, and some punctuation. Thumbpad is an FLTK application, originally intended for the Agenda VR3 PDA. It is based on utilware's "dotNote" for PalmOS.
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.
Tux Paint Default Stamps is a collection of hundreds of "rubber stamp" images (and associated descriptions and sound effects) for the children's drawing program, "Tux Paint." Both PNG and SVG images are included. Categories include animals, clothes, food, hobbies, household, medical, military, natural forces, people, plants, seasonal, space, sports, symbols, town, and vehicles.
"Tux, of Math Command" is an educational math tutorial game for elementary school level children. Like so many other Linux games, it stars Tux, the Linux Penguin. Players must answer math equations to shoot down comets which are falling towards their cities. It can run on Linux/UNIX, Win32, Mac, and BeOS.
Vectoroids is based on the X-Window PDA game 'Agendaroids,' but uses libSDL for graphics, sound, and input, and includes nicer graphics, sound effects, and music. The objective is to survive wave after wave of giant rocks, which you must shoot to break into smaller pieces, until they are completely destroyed.
Cool! I'd love to see more integration from within GNOME. (Like a way to select splash, cursor or invisible-window modes using Gnome Control Center :) )