Wikihow is a set of tutorials that every one can edit, there are more than 30 sthousand of them that explain how to learn to do multiple tasks.

Site and community for reporting personal observations of any plant or animal species in the world.

LocalWiki is a grassroots effort to collect, share and open the world’s local knowledge.We want anyone, anywhere to be able to learn about where they live — their local government, the history of their neighborhoods, streets, social movements, noteworthy local figures, social services, schools – every facet of life in their community. And we believe that this vast collection of local knowledge should be created by the people who know it best - individual community members working together. There are already over 70 independent LocalWiki projects in 9 countries and in 7 languages.

EyeWire is a game to map the brain from Seung Lab at MIT. Anyone can play and you need no scientific background. Over 80,000 people from 130 countries already do. Together we are mapping the 3D structure of neurons; advancing our quest to understand ourselves.