Reqtify - Reqtify is an easy to use, interactive application for managing requirements.
Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.
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.
Modern Requirements Suite4TFS - Modern Requirements Suite4TFS is an innovative, efficient and collaborative requirements management tool.
Visure - Visure offers a flexible , modern and complete requirements ALM Platform (Application Lifecycle Management).
Cradle - 3SL Cradle is a requirements management and systems engineering software tool.