ScrewTurn Wiki is an open source wiki software that allows you to create, manage and share wikis. ScrewTurn Wiki can be extended and customized with plugins and themes. It can store data using a simple, built-in file-system provider or, if you need performance and scalability, it can use SQL Server or MySQL. If you use Active Directory, you can integrate with that too. ScrewTurn Wiki is free and open source (GPLv2), meaning that you can use and modify it without limitations. In case GPLv2 is inadequate for your needs, we also offer commercial licenses.