xtUML.org	Access to open source BridgePoint and more.
Abstract Solutions	Abstract Solutions offers the iUML tool suite.
Pathfinder Solutions	Pathfinder Solutions sells a model compilation solution that links to existing UML CASE tools
Model Integration	It's impossible to leave Leon out of an Executable UML link list.
One Fact	The Mentor Graphics BridgePoint team now independently maintain BridgePoint. They also manage the xtUML.org website.
H.S. Lahman	Lahman on OO and MDA