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Not free, but from a small family-owned business - the classical hex editor used for reverse engineering by your favorite three letter agency:

010 Editor

https://www.sweetscape.com/010editor/

Thank you for mentioning this. I’ve had the most success with 010 Editor for find-and-replace across very large binaries and text files (100MB - 4GB). It seems much more performant than other text editors, much more than even favorite ones close to my heart like Sublime.

I've been looking for something like this.

Says not a three letter agency ;)

Don’t forget http://binary.ninja :)

It is not free

thanks for the links! especially the spiritual successor of Cantor Dust ;p