"Shane's Chess Information Database" is a huge chess toolkit with extensive database, analysis and chess-playing features.
Scid vs. PC is a usability and bug-fix fork of Scid. It has many interface fixes and improvements, and is fully compatible with Scid's .si4 databases. New features include a rewritten Gamelist, Computer Tournament, and FICS, Tree, Book and Graph improvements.
Enhancements and Bug Fixes to the Vulcan Tri-D Chess Program
This project is directed to the development of Vulcan, a Linux open-source Tri-D chess program written by Mauro Persano.
From the author's site ( http://www.fzort.org/mpr/projects/vulcan/ ): "vulcan lets you play against the computer a chess variant inspired by a certain well-known science fiction TV series."
Critical Patches:
> Mouse Bug fix (X11 only) -- Significantly improves GUI responsiveness to mouse.
> King Bug fix -- Prevents program crash due to a computer's piece capturing the player's king.
Feature Patches:
> Clock Option (X11 only) -- Adds an option to show or hide the clock showing the elapsed time for each player.
...