This tool lets you search your gadgets on your binaries (ELF format) to facilitate your ROP exploitation. The gadgets are found on executable segments.
You can download it from the following link: https://packetstormsecurity.com/files/download/115106/ROPgadget-v3.4.1.tar.gz
Source: https://packetstormsecurity.com/files/115106/ROP-Gadget-Tool-3.4.1.html