Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.
Innoslate - Innoslate is a complete product lifecycle management tool integrated with systems engineering, program management, and product design capabilities.
Reqtify - Reqtify is an easy to use, interactive application for managing requirements.
ReqView - Simple and powerful requirements management tool enabling easy requirements gathering, traceability tracking and offline collaboration.
rmtoo - rmtoo is a free and open source requirements management tool.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.