Heap organised database service (Java library)
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
Simple and powerful toolkit for BoltDB
FastVersion is a Qgis plugin for data versioning in a Postgis database
A rudimentary implementation of a basic document database in Go
Web developer development map
Big Sack: A lightweight Java Key/Value store with undo and disk cache.
Java API and Groovy Library for XML Scripting
Fast customizable time series web database for big data like log files