This document summarizes and compares several popular build systems and distributions for embedded Linux development: Yocto Project, Buildroot, OpenWRT, and desktop distributions. It provides overviews of each along with pros and cons. The key takeaways are that Yocto Project is best for commercial use with multiple configurations due to its modularity and hardware vendor support, while Buildroot and desktop distributions are better for beginners and hobbyists or single configuration use cases due to their faster build times and easier setup. OpenWRT is suited for replacement router/networking device firmware where package-based updates are needed.