codeBeamer ALM - Integrated application lifecycle management (ALM) platform
Innoslate - Innoslate is a complete product lifecycle management tool integrated with systems engineering, program management, and product design capabilities.
Helix ALM - Helix ALM is the single, integrated application that lets you centralize and manage requirements, test cases, issues, and other development artifacts and their relationships.
Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.
Visual Studio Team Services - Visual Studio Team Services (VSTS) provides unlimited Git hosting, cloud build for CI, agile planning and continuous delivery.
rmtoo - rmtoo is a free and open source requirements management tool.