FlexHEX

FlexHEX is a full-featured hex editor designed to edit binary files, OLE compound files, logical devices, and physical drives.

With FlexHEX you can inspect, modify, insert, search, or replace binary, ASCII, or UNICODE data. In addition to the powerful editing functions, FlexHEX includes an unlimited Undo/Redo feature, so you are never at risk of losing your data because of a typing error.