From Febooti Software:
Febooti Hex Editor is simple and easy to use freeware utility, fully integrated into windows properties pages, that allows to modify file binary content in the very precise and exact way. Hex editor provides significant benefit, namely, the possibility to edit strictly specified regions of file without affecting the layout of file or content shifting, thus giving a perfect control over your data. Various basic and advanced operations supported.
What's new in this version:
Version 3.0 adds bit-level binary editor; optimizes workspace size.