[felixhandte]

Ooh, thanks for mentioning these! I wasn't aware of the existence of these tools but yes it seems very possible that you could transform these other spec formats into SDDL descriptions. I'll check them out.

[pabs3]

There are a ton of these. GNU Poke comes to mind too.

[dloss]

Here's a list: https://github.com/dloss/binary-parsing