Any other bourne shell port on Linux?

Any other bourne shell port on Linux? I'm looking for Linux ports of historic Bourne shell versions (other than the Heirloom shell, which implements the SVR4/SVID3 level of the shell). For curiosity and research, I want to dig into the internals of historic shell code.
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Guest [Entry]

I hate answering with just a link to Wikipedia, but see Bourne-compatible shells which does list ash and dash which were the first two to come to mind for me (that weren't bash).

Guest [Entry]

GNU Bash is a very well-known and frequently used Bourne shell.