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.
Cube Trains is a puzzle game where you build elevated railways in a city. It features 3D puzzles, unlimited undo/redo, and smart placement of pieces. The non-linear level graph means you don't have to beat a level before unlocking the next one. The game comes with a built-in level editor, so you can build and share your own corners of the city.
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.