I am working on a reverse-engineered SDK for Stream Deck devices, called DeckSurf:
The SDK is open-source and on GitHub:
https://github.com/dend/decksurf-sdk
It's a hobby project, but one that I love working on because it unlocks some _really_ great hardware to be open to do anything I want it to be rather than be constrained by out-of-the-box client software that asks me to sign in with an account to get an extension installed.