Main:
https://github.com/solemnwarning/rehex
Releases, including AppImages:
https://github.com/solemnwarning/rehex/releases
A pretty good hex editing program for people in need of copying, pasting, and altering bytes inside a binary file. The AppImages on offer seem to work well across many different Puppies and Dogs, though for some reason in the latest Fatdog I had to launch the ReHex AppImage from the terminal, as it wouldn't respond to clicking the file trough ROX filer. But official Puppies and the FredX Dog Linux series seem to respond well to this. This one also has a more or less useful disassembler for the Intel assembly language. Cut, copy, insert, delete bytes doable. All the basics for hex editing of files are there.