Qase - Test case management software for QA and development teams that helps you make your product better.
TestRail - TestRail provides comprehensive test case management for software testing. Organize your testing, boost productivity, get real-time insights, and track progress toward milestones. Integrates with leading issue tracking and test automation tools.
Kiwi TCMS - The leading open source test case management system, with a lot of great features, such as bug...
TestLink - Test & requirements management
qTest - qTest beta – Cloud-based Test Management
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.