Sylbi is a conversation system that is not a forum and not a blogging platform, but a combination of the two. It grew from the idea that a blog with comments and a forum only differ in their perspective of the conversation. Both provide a chronological set of postings, initiated by someone, and, (potentially) replied to by others. The main difference is the perspective they present: a blog presents the perspective of the blog owner(s), while a forum presents the perspective of the forum and a topic defined in the forum. Sylbi allows you to look at conversations either way.
trillbox is a flexible and extendable toolkit for building dynamic Web pages. Written in Perl and based on Template::Recall, it provides "widgets" (or controls) that you can quickly integrate into your Perl Web application. trillbox widgets are designed to be independent points of control that can be easily plugged into a Web programming system, e.g. a CGI application, template-based, or included as part of an application framework. Widgets purposely have no direct knowledge of each other in order to offer the greatest flexibility (although they may be designed so that output and input can be piped between widgets).