1)   Groovy Hex Editor 1.5
Groovy Hex Editor is a tool for editing binary formats. I've paid particular attention to making it colorful and easy to use. Fully functional - no disabled features. Supports hex, decimal, ascii, multiple export features. Built in search and stats.

 2)   febooti fileTweak Hex Editor 1.0
Edit files either in hex or ascii mode in precise way to in order to preserve original layout of the file without shifting file contents. Integrated into windows properties pages Hex Editor is easily accessible and has intuitively obvious interface.