rmtoo - rmtoo is a free and open source requirements management tool.
BiZZdesign - Enterprise Architecture software that helps organizations dramatically increase the success rate of complex enterprise transformation, strategic investment allocation, and risk management.
Doorstop - Requirements management using version control.
SAP PowerDesigner - SAP PowerDesigner: Enterprise Architecture tools for digital transformation success
Requirements Quality Suite - The Systems Engineering Suite offers you the tools, processes and skills to Verification, Traceability, Reusability and Quality.
HOPEX - HOPEX is an integrated software solution to help drive business and IT transformation.