Hex Fiend

★★★★★

I’m impressed: Hex Fiend instantly opened an 8.5 gigabyte file I needed to extract some data from. No trouble searching for the starting bytes, no slowdown selecting or deleting multi-gigabyte section, no problem saving the multi-gigabyte result. Yes, this is on a machine with lots of RAM, but even here I’m used to apps choking on files this size. Even BBEdit gets slow when you hand it something that big.