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ChessTask is a frontend for easily creating chess tasks with LaTeX. The tasks are stored in a list which can be exported, either to a LaTeX input file, or to HTML files.
Virtual Chess Clock is a chess clock software: it can be used to simulate a chess clock on computer (typically a laptop). Virtual Chess Clock is designed to be easy to use. It is free, open-source and multi-platform.
This is a free, open source calculator of chess rating for tournament players. It has features like saving calculation with details. It has a multiplatform support thanks to Qt library, versions for Linux and Windows are released.
KBoard is a graphical interface for playing Chess, Shogi and variants. It is meant to be a 'better xboard': lightweight and nonintrusive, but powerful, customizable and graphically appealing, with real support for chess variants such as Crazyhouse.
A multiple clock software, to help playing for example board games. This (very simple) software alows you to control the played time for every player and put a time limit for each person. It is inspired from the chess clocks.