What are your favourite project management software for managing software development?

I have been using both Trello, Wunderlist, JIRA and others but I still don't feel they are spot on. I also wouldn't mind a free solution I can host on my own server as we are small teams anyway.

I need something with

• Tasklists (backlog)
• Kanban board (The swimlines but rarely work in Scrum)
• Estimation
• Commenting
• Clean UI and nice looking
• Some roadmap utility (would be great if clients could access this)
• Both tasks and bugs

Well probably a lot more in the similar context. I have also been using Flyspray in the past, but that's both a messy interface and very limited on features I think.