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This is a paid asset, but now you can download ACID NoSQL Data Storage Solution Free.
ACID NoSQL Data Storage Solution v1.3
The UnDBreeze is a ACID NoSQL (embedded Key/Value storage) based data storage framework for Unity 4.x. It is based on DBreeze. DBreeze is high performance of CRUD operations database, and supports transactional, ACID-compliant, multi-threaded.
There are two ways to use this framework.
Use the C# API, DataManager and DataStorage Unity components.
Use the PlayMaker intergration UnDBreeze Actions.
The UnDBreeze also support data encryption and data compression.
The UnDBreeze is all platforms supported. Tested on PC, Mac, iOS and Android.