Database
https://www.pytables.org/
https://pypi.python.org/pypi/sqlitedict
https://docs.python.org/3/library/shelve.html
https://github.com/pickleshare/pickleshare
https://github.com/erezsh/filedict
https://lmdb.readthedocs.io/en/release/
http://blitzdb.readthedocs.io/en/latest/
https://github.com/cloudpipe/cloudpickle
GraphDB
https://pypi.org/project/graphlite/