Hexadecimal Editors

I'm inspecting a binary file, but i need an hex editor to check the integers.

I'm using vim, but it seems to be big endian and i need to open the file as little endian.

Anyone know a good opensource/free hex editor (or any way to make vim's editor little endian)?

xxd
Also, you didn't specify whether you need one for Windows or Linux or (gasp!) Mac.