One Gram Software

Amorphous Maze
Trial versionCreate unusual looking mazes that look as if they were hand-drawn.
WindowsRobot University
FreeRobot University: A Challenging Block Fitting Puzzle
Windows
KarnaughMap
Trial versionKarnaughMap: Interactive Boolean Algebra Tool
WindowsShamrock
FreeUnique Jigsaw Puzzle: Assemble Shapes Without a Picture
Windows