What are some alternatives?
Planio - Planio makes web based project management and team collaboration more efficient and fun. It is the perfect platform for your projects, team members and clients.
Taiga - Project management platform for agile developers & designers
TargetProcess - Agile Project Management Web Application
Craft.io - All-in-one product management software for entire product lifecycle
Eylean - Eylean is an Agile project management software for teams looking to visualize and enhance their project process.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.