The best replacement for wiki is blog.

The best alternatives to wiki are rated as following:
★★★★★  blog
★★★★  sharepoint
★★★  cms
★★  knol
★★  forum
★  knowledge base
★  wikipedia
★  twiki
★  wiki
★  google docs
★  intranet
  wikia
  onenote
  mediawiki
  xiii
  google sites
  13
  moodle
  blogs
  content management
  confluence
  anime
  zeldapedia
  mirror
  plone
  angels
  saxton hale
  world
  google doc

Your alternative for wiki is not listed? Suggest!
Speaking about wiki, one probably shouldn't forget about paddle.

Other search terms related to wiki and their ratings are:
★★★★★ paddle
★★ fire and sword
★ you song
★ you nilsson
motive
You have in mind a companion for wiki and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of wiki in all years. Click on graph for more.
wiki
blog
sharepoint