Prolaborate - Collaboration software for Sparx Enterprise Architect
rmtoo - rmtoo is a free and open source requirements management tool.
netTerrain Logical - Automated network documentation & drawing tool
Doorstop - Requirements management using version control.
BiZZdesign - Enterprise Architecture software that helps organizations dramatically increase the success rate of complex enterprise transformation, strategic investment allocation, and risk management.
Requirements Quality Suite - The Systems Engineering Suite offers you the tools, processes and skills to Verification, Traceability, Reusability and Quality.