Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.
Enterprise Process Center (EPC) - Enterprise Process Center (EPC) by Interfacing is a comprehensive business process management suite that provides businesses several digitization and management programs in a single platform.
rmtoo - rmtoo is a free and open source requirements management tool.
Cameo Enterprise Architecture - Cameo Enterprise Architect | No Magic is one of the most respected providers of standards-compliant modeling, simulation and analysis solutions in the industry.
IBM DOORS - Product Management
Doorstop - Requirements management using version control.