epoll and kqueue are kernel APIs that enable efficient I/O multiplexing by registering interest in file descriptors once rather than repeatedly polling them, making high-concurrency servers feasible by reducing CPU overhead from O(n) scanning to O(activity).
PearOS is a Linux distribution built on Arch, Debian, or BSD that mimics macOS aesthetics while remaining fully open-source. Developed by Pear Software and Services and built transparently on GitHub, it includes pre-installed essentials, a graphical installer, and a native app store to eliminate terminal use for basic tasks.