oksh

Supports over 20 operating systems, from Linux and BSD variants to niche platforms like Haiku and SerenityOS, as listed in the README, ensuring a consistent shell experience across diverse environments.

Builds with a wide range of C compilers including clang, gcc, pcc, and even specialized ones like CompCert, enhancing flexibility in development and cross-compilation scenarios.

Includes all necessary portability code, eliminating dependencies on external ksh implementations and simplifying deployment, as emphasized in the project philosophy.

Provides configure flags like --no-thanks for easy cross-compilation, useful for targeting embedded or specialized systems, though it requires manual tweaks.