DBFrames is an application framework for building data aware applications for Windows Mobile devices.
It uses PythonCE, SQLite and PocketPyGui.
Version for Android (writen in Java): https://github.com/yurtk/dbfragments
db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
You can consider this a general "JavaFile Object Correction" project. It seeks to add in whatever features are missing or weak in the JavaFile implementation. For example, currently in Java, once a file is made read-only it cannot be reset back to a w