I order of the most I like to the ones I hate: 1- Trac: you can host it, you can add you plugins, it has wiki, there are hosted sites that can give you one repository, but can look old compared to today social media, but dude you don't want facebook if you are working. 2- Jira: could be better, have some features that I hate and consider useless. can be hosted or bought as a service. You can handle a lot of projects with this, have integration with all they products to give more services (Confluense...) 3- TFS: very good if you have a good admin working over it. The integration with VS is wonderful. 4- Spiceworks: a lower version of Jira, we ate it cause gave us a lot of problems.