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i.Hex is an intuitive and user-friendly Hex editor that can be used on any Windows computer. Small cross platform hex editor, with support for fast loading of large files.

Features:

Doesn't load all the file at once. Just a pane of 1 MiB is loaded at any given time, thus it can edit/view very large files almost instantly.
Visualiser tool for binary structures.
View data as text tool.
Cross platform: Windows, Linux and Mac.
Able to compare two files.
Open source.
Search for hex or plain text.
Copy data as hex, text or source code.
Paste data as hex or binary.
Save the selection to a file.
Psuedo random byte generator available.
Doesn't use the registry (Portable).
Oh yeah, it's free, fast and small...