Libre C compilers

I’m on a quest to deepen my understanding of the software tools I use by exploring alternative build processes. My development environment typically consists of aarch64 and x86_64 machines running Linux or Darwin operating systems.

I’m particularly interested in C compilers that support the C99 or C11 standards, with a focus on minimal implementations that offer straightforward binary distribution or bootstrap processes. I’m seeking options beyond the mainstream GCC and LLVM ecosystems to broaden my perspective on compiler design and implementation.

So far, I’ve come across a few interesting projects:

I’d appreciate any recommendations for additional C compilers that align with these criteria, as well as any insights or experiences you might have with alternative compiler implementations.
Your feedback and suggestions would be valuable in expanding my knowledge in this area.