The best replacement for wikipedia is britannica.

The best alternatives to wikipedia are rated as following:
★★★★★  britannica
★★★  knol
★★★  encyclopedia
★★  wikileaks
★★  encyclopedia britannica
★  wikia
★  wikipanion
★  fbi
★  wiki
★  encarta
  world
  encyclopedias
  conservapedia
  britannica nature
  uncyclopedia
  wikimedia
  scholarpedia
  señor de los milagros
  encyclopaedia

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Speaking about wikipedia, one probably shouldn't forget about paddle.

Other search terms related to wikipedia and their ratings are:
★★★★★ paddle
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Google Trends

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