Free: Open source with Apache license. No plans. No limits. You can install it in your own servers.
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Teamwiesn Alternatives
Teamwiesn is described as 'Offers managed Redmine Hosting packages with Git and Jenkins support. It is a web based service for team collaboration (Task management, Wiki, central file storage inclusive versioning, contact management tool and CI server)' and is an app. There are more than 25 alternatives to Teamwiesn for a variety of platforms, including Web-based, SaaS, Windows, Linux and Mac apps. The best Teamwiesn alternative is Redmine, which is both free and Open Source. Other great apps like Teamwiesn are JIRA, Trac, Mantis Bug Tracker and Jira Clone.