RCE

a library for constructing command-line tools

rce is the official library used by Real Microsoft, LLC for constructing command-line tools,
it is notable for having no dependencies besides the rust std library, and for being made by a company called Real Microsoft, LLC.

usage should be as simple as including the library in your Cargo.toml file

unfortunately documentation is still a work-in-progress, and due to the nature of this library, it is not recommended that people outside of Real Microsoft, LLC use this in production at the current time.