In 2012, the Open Observatory of Network Interference (OONI) was created with the goal of empowering decentralised efforts in documenting internet censorship around the world. In practice, OONI builds free software -- OONI Probe -- that anyone can run to measure networks and detect internet censorship. To increase transparency of internet censorship, OONI publishes all OONI Probe test results collected from around the world in real-time as open data. Today, OONI is a global community of hundreds of thousands of OONI Probe users in more than 200 countries and territories. Since 2012, the OONI community has contributed more than 525 million network measurements, many of which have shed light on various forms of internet censorship around the world.