- The Ethereum Foundation (formally, Stiftung Ethereum) is a Swiss non-profit established in Zug, Switzerland in June 2014.
- ETHDEV is a consortium of development organizations established in varying legal jurisdictions including London, Amsterdam, and Berlin. This is the operational/development arm of the Ethereum project.
As the development of Ethereum was anticipated to require many upfront resources and eventually trail off in development, over time developers have joined complementary organizations in the ecosystem, including Consensys, Slock.It, ETHCORE, and others.
Because it would be infeasible for any single organization to pursue all development avenues, the expansion of companies focusing on specific niches of the ecosystem is considered a positive move and adding value to the ecosystem as a whole.