@dor
Took a bit longer but you can now explore proposed EOF opcodes on evm.codes -- navigate to the fork selector and select the EOF (Prague) fork and explore the proposed changes and opcodes!
This is a starting point; we would love submissions from the community to make this better.
Many thanks to @hangleangeang for his contributions via a bounty on @bountycaster !
CC: @draganrakita, @shazow.eth, @cqb, @maurelian.eth