I cant beleive nobody mentioned Redmine (foss). Its the best tool for that purpose out there that can run hundreeds of projects with thosands of users without a hitch. You can customize it to extreme with plugins to look whatever you like but even clot instance is very capable. Its extremelly stable and secure too. Cant recommend it highly enough.
Gitlab iz alternative too but most of it is complete DevOps platform with lots of opionions you may not want or like many of which are not customizable. Redmine has thousands of plugins and its focus is project management, not necesserally development projects too, you can even use it as service desk for end users.
Gitlab iz alternative too but most of it is complete DevOps platform with lots of opionions you may not want or like many of which are not customizable. Redmine has thousands of plugins and its focus is project management, not necesserally development projects too, you can even use it as service desk for end users.