EZDM (ezdungeonmaster) is a simple set of tools for dungeon managers, targeting AD&D 2nd edition rules. It's not an RPG game, but some helper tools for people DM-ing real games, and is designed not to get in the way of roleplay and storytelling, but simply help do the math during encounters and leveling. Dice rolling can be done by the computer, or the tools can be set for manual dice, in which case you simply enter the results of the roll. All game data, charts, and character sheets are stored in JSON format. The EZDM kit defaults to using a simple dialog-based GUI which requires easygui, but a console interface is also available.
Xjig Manager provides an easy way to launch Xjig, the jigsaw program. It allows you to preview images, set puzzle width, select piece size, swap mouse buttons, fix rotation angle to 90 degrees, set piece distortion, set shadow, set animation speed, and perform piece flipping and cropping. The 'no shuffle' option is good as a starter for younger children. It works with PNG, GIF, JPG, and BMP images. There is an image preview that can be seen as a floating picture while you solve the puzzle.