This repository contains:
disasm - a tool that disassembles x86_64 ELF binaries and prints to stdout
rop-tool - a tool that finds locations of rop-gadgets in a x86_64 ELF binary and prints to stdout
syscall-accumulate - a tool that finds all direct references to syscalls in a x86_64 ELF binary and prints the list to stdout.
See associated blog post here
(Check your distro listings)