FogBugz is agile-first, manages projects, tracks bugs and shipping. It includes an issue tracker, project management and scheduling, wiki, and customer support features like email routing and discussion groups. It offers integration with all major version control systems.
Ranked in these QuestionsQuestion Ranking
Pro Helpdesk features
Customers can send emails for further processing.
Pro Evidence-Based Scheduling
EBS produces ship date probability distributions, see here.
Pro Backed by big company
The same company behind Stack Overflow and Trello.
Pro Intuitive UI
The UI is very well thought through. All the right stuff is in the right places.
Con Self-hosting is pricey
The minimum is 50 users at $15 per user per month.
Con Cannot be used without an account
You cannot show someone a ticket that does not have an account.