In no particular order...
Dave Lombardo - Slayer, Grip Inc., Fantomas, Testament (The Gathering album)
Tommy Aldridge - Whitesnake
Deen Castronovo - Geezer, Bad English, Hardline, Journey
Raymond Herrera - Fear Factory
Charlie Benante - Anthrax
Danny Carey - Tool
Josh Freese - A Perfect Circle, Static-X (studio recording for Shadow Zone album)
Ryan Van Poederooyen - Terror Syndrome, The Devin Townsend Band, Non-Human Level, TheMightyOne
Neil Peart - Rush
Mike Portnoy - Dream Theater, Liquid Tension Experiment, Avenged Sevenfold