Here are the most known side works of the members of tool.
Maynard James Keenan:
A Perfect Circle
lead vocals, vocals, groud and co-writer.
The hollow
Magdalena
Rose
Judith
Orestes
3 Libras
Sleeping beauty
Thomas
Renholder
Thinking of you
Breņa
Over
Paul D' Amour:
Lusk - Free Mars (1997)
vocals, electric & acoustic guitars, bass, synthesizer, percussion, and co-writer