Relyze!

The IDA Pro Disassembler and debugger is a multi-processor disassembler and debugger hosted on the Windows, Linux and Mac OS X Platforms.

PE Explorer lets you look inside a variety of different 32-bit Windows executable file types, such as EXE, DLL and ActiveX Controls, perform static analysis, reveal a lot of information about the function of the executable, and collect as much information about the executable file as possible, without executing it. PE Explorer provides functions for disassembly and inspection of unknown binaries, modification of the properties of executable files, plus resource editing and translation features.

Binary Ninja : A Reverse Engineering Platform

Bokken is a GUI for the Pyew and Radare projects so it offers almost all the same features that Pyew has and and some of the Radare's ones. It's intended to be a basic disassembler, mainly, to analyze malware and vulnerabilities.

ODA is an online disassembler for a wide range of machine architectures, including: Alpha, ARM, AVR, Intel x86, Motorola 68000, MIPS, PDP-11, PowerPC, SPARC, Z80, and more! Upload a Windows PE file, ELF, or raw binary and then view the disassembly and object file meta date such as symbols and sections.