FineDB was created by Amaury Bouchard of France in June of 2013, listed on his website as a project that he could use to learn more about network programming, multi-threading, replication and clustering. It is based on Nanomsg and LMDB and is currently open-sourced and available on Github. There have been no major updates to the code since September of 2013.
After compression, data is stored in a key with a description (1 byte), replication timestamp (8 bytes), expiration time stamp (8 bytes), and the data (n bytes). The length of the key is 64KB and length of the data is 4GB.
FineDB makes use of Google's Snappy (previously known as Zippy), which is open-source and written in C++. Snappy uses byte-oriented encoding during the compression process.