Godot Engine is free, open source and has no revenue sharing because you can pretty much do whatever you want with it. However, they still need to fund developers working on it. So now they're officially properly launching a direct way where anyone can contribute to Godot Engine financially.
According to their website at time of writing they have €25,591 per month coming in from this fund. They do also get £9,587 a month from Patreon but they're hoping to move over to their direct funding. There's also less fees for their direct funding platform compared to the likes of Patreon, so more of the money will go directly into Godot development.
As stated in their announcement: "By relying more on recurring user-funded contributions and company sponsorships, we reduce our dependence on large one-time grants from corporations. This financial independence empowers us to prioritize the needs and interests of our community and the open source principles at the core of our projects. Your help ensures that we can create our own journey, uphold our core values, and continue to evolve the engine in ways that truly benefit you, the users."