PottyMouth transforms completely unstructured and untrusted text to valid, nice-looking, completely safe XHTML. PottyMouth is designed to handle input text from non-technical, potentially careless, or malicious users. It produces HTML that is completely safe, programmatically and visually, to include on any Web page. You don't need to make your users read any instructions before they start typing. They don't even need to know that PottyMouth is being used.
bbgun moves phpBB forums to WordPress blogs. bbgun pulls a forum entry from the phpBB database, translates the text (bbCode to strict XHTML), date, and other fields, and pushes the translated entry into the WordPress database. With bbgun, you can move individual posts, move entire threads, move only certain users' posts, map phpBB users to WordPress authors, and specify WordPress categories for the new entries.
SCT (Sphene Community Tools) is a collection of Django applications that are designed to be easily pluggable into any Django project. It currently consists of a Wiki and a Board application. It contains an example project that allows users to create a community Web site containing the Wiki and Board applications without any further coding/configuration changes.