The NetBSD is also a great starting point for people who want to port to weird architectures. It's simple and a little old fashioned, but it's in the sweet spot

The NetBSD is also a great starting point for people who want to port to weird architectures. It's simple and a little old fashioned, but it's in the sweet spot for most bootstrappable C compilers for memory-constrained devices. This or dmalloc are usually the easiest to get up and running on a device where you can't or don't want to trust the system libraries.