Although not an exhaustive list, here is a group of articles that I find myself returning to often for personal, professional, and aesthetic reasons. I will leave it to others to try to figure out why.
I am an active user on the Bogleheads Wiki, a collaborative enterprise by the members of the Bogleheads Forum. The Bogleheads are dedicated to the dissemination of the investing philosophy of Vanguard founder John Bogle. From the Bogleheads Wiki:
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The Bogleheads approach begins with an investor deciding on percentage allocations to various asset classes, such as U.S. stocks, international stocks, U.S. bonds, etc. The desired allocations are then implemented using low-cost vehicles which are true to the targeted asset classes. Tax costs are carefully considered, influencing decisions as to what investments to place in taxable versus tax-advantaged accounts. Bogleheads emphasize regular saving, broad diversification, and sticking to one's investment plan regardless of market conditions.
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Wikis of interest
Battlestar Wiki - Free, open content Battlestar Galactica encyclopedia and episode guide.
LyricWiki - Free site which is a source where anyone can go to get reliable lyrics for any song, from any artist, without being hammered by invasive ads.
wikiHow - Collaborative writing project to build the world's largest, highest quality how-to manual.
Wikiquote - Free online compendium of sourced quotations from notable people and creative works in every language.
Wiktionary - Collaborative project to produce a free-content multilingual dictionary.