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ScrewTurn Wiki-c# dot net wiki engine

http://www.screwturn.eu/Wiki.ashx

ScrewTurn Wiki is a performant and simple Wiki engine, written in C# and based on the ASP.NET 2.0 platform.Its main features are described below.
    * Free and open-source
    * No need for a database (but SQL Server and MySQL are supported with Plugins)
    * No need to touch IIS or ASP.NET configuration (works in ASP.NET Medium Trust environment)
    * High performance and scalability on every hardware configuration, thanks to a smart and configurable content caching system
    * Low bandwidth usage, thanks to the (configurable) usage of custom ViewState Compression and HTTP Compression
    * Simple deployment, administration and usage
    * Small footprint
    * Theming available entirely through CSS files (CSS Media Types are fully supported)
    * Automatic page backups (performing a rollback is as easy as a mouse click)
    * Simple user accounting system (with Administrators and Users and a built-in admin account)
    * Useful features such as Page-level coarse-grained authorization, the possibility to make the Wiki completely public (no registration needed to edit pages) or Private (anonymous access is not allowed)
    * Page Categorization and Discussion
    * Page Transclusion and Snippets
    * Plugins support (see documentation)
    * Protection against dangerous files, scripts and spammers (Captcha control on registration)
    * Multilanguage interface (English, Italian, French, Spanish, German, Brazilian Portuguese and Russian)
    * RSS 2.0 notifications for every page as well as for the whole Wiki and for Page Discussions