Planning to evaluate a couple of open source Enteprise Architecture tools that are becoming popular. IBM System Architect was the de-facto commercial EA tool in the market and we were actively using it for our customers.
First is "The Essential Project" that was launched last year. It is based on the Protégé ontology tool and allows you to create a meta-model for your EA. It has a EA repository and reporting tools.
Second is a tool called "iteraplan". This tool is more popular in Europe and also has an Enterprise Edition that is free for use, but without the source code.