From llvm-mos

llvm-mos has a vibrant community both officially and unofficially affiliated with it. The main official hub is our Discord; drop by if you have questions or would like to contribute.

There are also a number of other projects loosely affiliated with llvm-mos; here are links to a few.

Site Description
mega65-libc C library for the Mega65. More thorough platform-specific code than present for the Mega65 llvm-mos SDK. Works with CC65, Clang, and KickC.
mysterymath's blog Current llvm-mos maintainer's blog. llvm-mos internals discussed often at a very thorough level of detail.
rust-mos Rust frontend port based on llvm-mos. Usually trails somewhat behind llvm-mos's releases.