SNFQ is a Simple NetFilterQueue Library developed by Ravehorn.
It is built on top of NetfilterQueue (https://github.com/kti/python-netfilterqueue) and basically is a higher-level wrapper with limited functionality but simpler usage. It also applies linux commands necessary to manipulate the queue on a basic way, such as opening and closing iptables.
My projects using the SNFQ Library:
https://github.com/TheRavehorn/File-Interceptor
https://github.com/TheRavehorn/Code-Injector (lib slightly modified to use Python 2)