Pybik is an interactive, graphical, single player puzzle about the cube invented by Ernő Rubik. Besides the cube, the program can handle towers and bricks (non-cubic puzzles). Pybik also has solvers, pretty patterns, and a collection of various moves. The cube can be manipulated with the mouse or keyboard. You can change the colors or images on the faces of the cube.
GCompris is an educational software suite with numerous activities for children aged 2 to 10. Some of the activities are game-orientated, but nonetheless still educational. These include computer discovery (keyboard, mouse, different mouse gestures), algebra (table memory, enumeration, double entry table, mirror image), science (the canal lock, the water cycle, the submarine, electric simulation), geography (place the country on the map), games (chess, memory, connect 4, oware, sudoku), reading practice, and others (learn to tell time, puzzles of famous paintings, vector drawing, cartoon making, etc.). It currently offers in excess of 100 activities, and more are being developed.
Diagnil is a GUI application to help solvers of diagramless crossword puzzles. It accommodates puzzles distributed electronically using several file formats (puz, jpz, xpf, and ipuz) as well as those distributed in print form. Although software for conventional crosswords has existed for years, the diagramless variant has received little attention. Diagnil attempts to fill that void. It lets you solve puzzles by entering words, placing them on a grid, and moving them around the screen until the final shape is achieved.
USokoban is a Sokoban clone for Linux. It features open external XSB Sokoban levelsets, support for level sizes up to 60x60, support for solutions of unlimited length, a fast algorithm for box pushing, unlimited undos, changes of skins, pasting of levels or solutions directly from the clipboard, copying solutions to the clipboard, a simple solver, and solution management.