[Asm2D]

I think AsmGrid has a great overview of X86 and AArch64 instructions:

  - https://asmjit.com/asmgrid/

[mananaysiempre]

For x86 encodings, there’s also http://ref.x86asm.net/index.html and of course the venerable https://sandpile.org/.

[rfl890]

Felix Cloutier's page has always been my go-to

[cylinder714]

https://www.felixcloutier.com/x86/

[__alexander]

I haven’t seen this site before. Thanks for sharing it.

[electroglyph]

wow, that's great. thanks for sharing!