They're pretty unique, the Wikipedia article has a good summary under "Developers and Funding": https://en.m.wikipedia.org/wiki/Signal_(software) https://en.m.

They're pretty unique, the Wikipedia article has a good summary under "Developers and Funding": https://en.m.wikipedia.org/wiki/Signal_(software) https://en.m.wikipedia.org/wiki/Signal_(software) Initially funded by a $50M loan from the co-founder of Whatsapp. In addition to consulting contracts they have received millions in grants and donations from Mark Shuttleworth, Radio Free Asia, the Freedom of the Press Foundation and others.