There are a lot of encyclopaedias on the Internet: free ones and paid ones.
The most famous encyclopaedia, I believe, is Encyclopaedia Britannica. I'm sure it's subscribed. I've used English book version many times at university. I think it's the best encyclopaedia in the world.
Well, the most used online encyclopaedia is maybe Wikipedia. Of course it's free! We often see its articles around the top of search results when we search on Google or Yahoo!. Wikipedia has a wide variety of articles, but it's written by anyone. So I don't think it always provides us right information.
Some people parted from Wikipedia and started a new project called Citizendium. Citizendium is pronounced as /sɪtɪ'zəndɪʌm/ on International Phonetic Alphabet (my college teacher says so). It's edited by some experts, so Citizendium says it's trustful and has high quality. The teacher of mine says it's OK to use its articles as a reference when writing essays and papers at university.
Google also launched a new project inspired by others. The project is called Knol. Knol has an original feature that others don't have: it contains more than 1 article for 1 thing (or rather phenomenon). We can create articles on the same thing each other, and people compare them and choose the best.
I tried writing this entry continuously without beginning a new line in 1 paragraph.
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