iurnah/rp
rp++ is a full-cpp written tool that aims to find ROP sequences in PE/Elf/Mach-O x86/x64 binaries. It is open-source and has been tested on several OS: Debian / Windows 8.1 / Mac OSX Lion (10.7.3). Moreover, it is x64 compatible and supports Intel syntax. Standalone executables can also be directly downloaded.