Vanilla is a simple hypertext system, essentially a cross between a
WikiClone and a weblogging system. Its potential uses, however, are
unlimited. It is currently used as department-level/small-company
Content Management System, project group communication tool, base for
Intranets, idea interconnector, Knowledge Management system, contact
database &c.

It's pretty easy to extend its functionality through small REBOL
programs, so-called dynasnips.

Version 0.5 has been a pretty big step forward. The news:

- User and Session Management
- New and Improved Template System
- New and Improved du-jour Weblog System (Calendar and Comments!)
- Dynasnip Caching
- Extremely Fast Backlink Generation

Read more at
- http://www.langreiter.com/vanilla/

Enjoy!