Tokyo Cabinet is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value.
Key/Value
http://fallabs.com/tokyocabinet/
FAL Labs
JP
2006
Sugamo Cabinet
Open Source
C++
Lua, Perl, Python, Ruby
GPL v2
https://en.wikipedia.org/wiki/Tokyo_Cabinet_and_Kyoto_Cabinet