Hibernate's core Object/Relational Mapping functionality (prefer the hibernate-user room/stream on https://hibernate.zulipchat.com)
OpenDroneMap is a tool to postprocess small Unmanned Aerial Vehicle (sUAS), balloon, kite, and street view data to geographic data. Join the conversation: http://community.opendronemap.org/
Propel2 is an open-source high-performance Object-Relational Mapping (ORM) for PHP >= 5.4
Efficient, Pythonic bidirectional map implementation and related functionality.
Domain Oriented Database Mapping Framework for Java 8
A mapping layer for the OData gem that integrates with ActiveModel.
Mapnik is an open source toolkit for developing mapping applications