Wikipedia, to which I refer to often, is a completely free online encyclopedia very reliable, as the most noble.
There is all you can participate by writing or translating new entries, in several languages \u200b\u200band has reached the significant amount of one million and a half of entries.
Here are two links that lead to main page (in English) and the Italian page.
There are several projects, always in the group Wikipedia, which are dedicated to specific areas:
Wikctionary - multilingual dictionary
Wikibooks - free educational books
Wikinews - news articles
- collection of aphorisms and quotations
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