This is the freeware version of the Cygnus Hex Editor. Cygnus Hex Editor is the fastest and easiest hex editor available anywhere!

Cygnus Hex Editor features include MDI interface, multi-level undo and redo, extensive drag and drop support, blazing fast search, search and replace, delete and insert characters as easily as you can in a word processor, edit files up to available virtual memory (up to 2GB), much more.