Free Hex Editor
Free hex editor (Frhed) is an binary file editor for Windows. It is small but has many advanced features like ability to load big files partially.
wxmedit is a cross-platform text and hex editor, derived from madedit .
wxmedit is a crossplatform text and hex editor, derived from madedit . it adds automatic updates, bookmarks, selecting lines with a tripple click, a freebasic syntax file, more supported encodings (l1, cp850, cp437 etc, koi8, utfx), better max os x and windows support, better hex editing support, nicer dialogs based on code::blocks wxsmith, more localizations, is a bit more stable and comes with an improved build system.
portable text-editor hex hex-viewer hex-editor binary-editor