Not sure whether it is relevant, but … there is a German Q/A site, focused solely on programming topics, and according to http://codekicker.de/fragen/Software-verwendet-codekicker they developed a BBCode parser for .NET ( https://archive.codeplex.com/?p=bbcode ) (open source, CCA3.0 license) (I understand this, on a technical level, only in so far that this is not a complete solution, but may be a useful building block, but am sure there alternatives…)