ZenTao is a project management software for agile teams. It is a professional Application Lifecycle Management. It is well structured and can be flexibly extended. It also has powerful search features, various reports and complete API.
It is very flexible and fitted really well with agile development work. whether you are using kanban ,waterfall and scrum work flow, it supports all of those.
It's very useful for my Scrum team. I can't imagine that ZenTao is been more than 10 years but I just noticed this excellent tool. It deserves to have a try!