Radare3 is the one and only interactive, programmable, extendible, multi-processor disassembler and debugger you will ever need to use!

Installation is as simple as it gets:

$ sudo ./install.sh

To start r3, simply run:

$ r3

Or for the 64-bit version:

$ r3x64

And you'll be prompted with the brand new state-of-the-art radare3 GUI: