Codegiant includes pretty yet powerful tools for agile project management. It is meant to be a single platform for project management. People are loving it as a great alternative to Jira as it is faster with better UI/UX and is free to use for upto 5 users.
Codegiant includes issue tracking, hosted Git repositories, continuous integration and documentation in a single platform. Slack Integrations, API integrations are also in place with Codegiant.
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.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Pivotal Tracker - Pivotal Tracker: The awesome, lightweight, agile project management tool for software teams. Get your 30-day Free Trial started today!
Nifty - Manage projects, work, and communications in one place.
openDesktop.org - The website openDesktop.
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.