Beryl is a compositing window manager for the X Window System.
Beryl is a fork of Compiz, and is currently being merged back into Compiz., under the name of Compiz Fusion.
Beryl is the project name for the Quinnstorm branch of Compiz, announced on 19 September 2006 after Quinnstorm and the development team, the leader of which was Eamonn Bell, decided that the fork had come too far from the original Compiz started by Novell (compiz-vanilla). After the Novell XGL/Compiz team (mostly David Reveman) refused the proposition to merge the Quinnstorm changes with compiz-vanilla, the decision was made to make a real differentiation. As of 20 October 2006, version 0.1.1 has been released into the original compiz-quinnstorm repositories and mirrors. On 15 March 2007, version 0.2.0 FINAL was officially released.