InvisionFree

InvisionFree is a company owned by Zathyus networks, which also runs Zetaboards. Invisionfree offers a free IPB 1.3-style message board as well as hosting for it. However, Invisionfree cannot expand past version 1.3 of InvisionPower Board without every board having an InvisionPower license, so Zathyus Networks created their own unique forum software, Zetaboards.