“... Much of the true value of the Web comes from targeted, specialized sites.
Small sites can't afford monster CMS products, so a good low-end system is highly welcome.” — Jakob Nielsen

WackoWiki – Small, lightweight, handy, expandable, multilingual Wiki-engine. WYTIWYG editor, easy installer, many localizations, email notification on changes/comments, several cache levels, design themes (skins) support, HTML5 compliance, page rights (ACLs), page comments and is distributed under the BSD License.

• cms engine — to manage the content of the site in handy manner
• weblog (multiuser version) — to intercommunicate with each others in community
• wiki — to collaborate with each other in the team on project-related basis

Key Features

1. light-weight
2. small code base
3. designed for speed and extensibility
4. easily customizable
5. quick and easy installation
6. clean user interface
7. integrated user management
8. access control through per-page access control lists
9. integrated page commenting functionality
10. WhatYouThinkIsWhatYouGet editing
11. full revision control, of course
12. powerful diff between revisions
13. clusters & relative addressing
14. page watching & email notification on changes/comments (simple diff included in email), RSS 
15. completely multilingual
16. links can be CamelCase or FreeLinks
17. several levels of caching (backlinks, pages, queries, templates)
18. automatic table of contents generation
19. on-the-fly correction of punctual typos & spec. characters
20. design themes (skins) support
21. uploads per page or global.

• just test
• get WackoWiki