Kudos - this is neat - I especially love the library of pre-existing descriptions, which helps me to learn about the tool as well as about an abundance of file formats without re-engineering time wasted.

This is somewhat akin to ASN.1.

My personal feature wish list:

- support writing as well as reading;

- support generating Rust, Julia and Swift code.

- upload button to let users add to a contrib/ folder of existing format descriptions