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NTA-Monitor has released the arp-scan detection and fingerprinting tool under the open source (LGPL license) concept.
It has been tested under various Linux based operating systems and seems to work fine.
This will only compile on Linux systems. You will need a C compiler, the “make” utility and the appropriate system header files to compile arp-scan. It uses autoconf and automake, so compilation and installation is the normal ./configure; make; make install process.
You can download arp-scan here:
http://www.nta-monitor.com/tools/arp-scan/download/arp-scan-1.4.tar.gz
Please read the man pages arp-scan(1), arp-fingerprint(1) and get-oui(1) before using this tool.