Today, January 4, 2017, comes with the newly released version of the x64dbg debugger application.
This is an open-source x64/x32 debugger for Windows and is under constant active development.
The x64dbg can debug both x64 and x32 applications and used Qt, TitanEngine, capstone, Yara, Scylla, Jansson, lz4, XEDParse, Keystone, asmjit, and snowman.
Simple, powerful development this debugger comes with many features.
You can download the application from here or read more from the official webpage.