Neighborly - The easiest way to invest in your community
Rooster - Local sharing community where neighbors share free resources
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
CityCop - Outsmarting crime. Together.
Data Dashboard by Wikimedia Foundation - Compiled data of the Worlds busiest public site
Airbnb Neighbors - Complain about your neighbors who rent out their apartment