NationStates is a free political simulation game founded by author Max Barry back in 2002 (previously). Loosely based on his dystopian corporate thriller Jennifer Government, the game starts by asking players to provide some national trappings and answer a few civics questions, then generates a virtual country with a matching political outlook. Periodic policy decisions like mining rights and compulsory voting allow players to further modify their country along axes of social, political, and economic freedom, arriving at one of twenty-seven colorful government types like Tyranny By Majority or Scandinavian Liberal Paradise. There's also a healthy roleplaying community -- players can discuss current events in the General forum, practice wargaming in International Incidents, form cooperative Regions to debate internal affairs (many of which form their own communities), and elect Delegates to send to the World Assembly (so renamed after an amusing cease-and-desist from the real-world U.N.). Their collective history is thoroughly recorded in the 35,000-article NSWiki, which provides a detailed legislative record, gameplay guide, and profiles on many of the 90,000 active nations, 8,000 player regions, and countless characters that currently make up the game world.
"...for the scientific community, the most critical organ of the incentive system is the cycle of credit."
Just how credible is Wikipedia? While some have tested this empirically, others have chosen more dubious methodology. For a site that gives no credit to its post authors, one wonders, why even bother?
A Million Penguins, the wiki novel mentioned previously on MeFi, is complete, and a research paper about it has been released. [more inside]
WiserEarth is a user-editable relational database that aspires to list, categorize, and describe every non profit and civil society organization on Earth. It currently includes 104,304 organizations which can be viewed by name, location, or areas of focus. You can perform complex searches. You can post (or search) jobs, events, and resources. You can discuss areas of focus, such as Urban Forestry, Evolutionary Ecology, or government oversight and reform. You can also visualize the networks connecting these areas of focus and the various organizations.