Kaitai is pretty nice. Hex editors with structure parsing support used to be more rare than they are now, so I've used https://ide.kaitai.io/ instead a few times.

Also, the newest Kaitai release added (long awaited) serialization support! I haven't had a chance to try it out.

https://kaitai.io/news/2025/09/07/kaitai-struct-v0.11-releas...