At my current job we use Jira and personally I think it's a pretty good product, at least for a SCRUM workflow. Definitely beats any similar tools I've used in the past. I think the scrum board looks clear, it's easy to create user stories and tasks and it's also easy to switch between an operational and strategic workflow.

We also use Confluence which also seems to do it's job properly as a wiki.

I'm personally considering using Jira for my own projects in the future.