Steam Workshop::4 Player Chess

Chess Exerciser on Steam

Workshop Steam::Duchess - 6 Player Chess

Steam Workshop::Multiplayer Circular Chess Collection (Modern & Byzantine)

How to set up a 4 Player Chess game to play with your friends - Chess Forums

Steam Workshop::All Things Chess

Richmond Chess for Kids. After School Chess and Summer Camps. Discover, Learn, and Play Chess Virtually and In Person.

List of chess variants - Wikipedia

Steam Workshop::6 Player Chess Collection

Steam Workshop::Superchess (4 players)

FourPlay Chess on Steam