Atlassian JIRA - Atlassian JIRA is a project management and tracking software for the business users, developers, programmers, etc.
ZenHub - ZenHub is how the world's best software teams work together. Trusted by NASA, Docker, and Rackspace. Start free today!
Pivotal Tracker - Pivotal Tracker: The awesome, lightweight, agile project management tool for software teams. Get your 30-day Free Trial started today!
YouTrack - Free, online, easy-to-use, fully customizable issue tracking and agile project management tool your development team will love, by JetBrains. Our cloud or your server.
Zube - Project management for developers.
Codegiant - Codegiant - Issue tracking, git repositories, continuous integration and documentation in a single platform.