STSdb - Embedded .NET Database

•    CSharp

STSdb is an embedded object database system (NoSQL key/value pair storage engine) designed for mission critical and real-time applications. It provides intuitive use and blazing performance. It has transaction support, Snapshots, LINQ, Custom compression and lot more. STSdb is implemented and inter-operate on Windows, Linux, BSD, UNIX, Mac OS X under the Mono platform.

Perst - object-oriented embedded database

•    Java

Perst is McObject's open source, dual license, object-oriented embedded database system (ODBMS). Perst gives developers the ability to sort, store and retrieve objects in their applications with maximum speed and with low memory and storage overhead, while leveraging the object-oriented paradigm of Java and C#. It is available in one edition developed as an all-Java embedded database, and another implemented in C# (for Microsoft .NET Framework applications).

EyeDB - Object Oriented Database Management System

•    Java

EyeDB is an Object Oriented Database Management System (OODBMS) providing an advanced object model (inheritance, collections, arrays, methods, triggers, constraints), an object definition language, an object query language and C++ and Java bindings.

db4o

•    Java

db4o open source object database, native to Java and .NET.

ZODB - A Python object-oriented database

•    Python

ZODB provides an object-oriented database for Python. It does not require separate language for database operations. It has very little impact on your code to make objects persistent. It also does not require database mapper as using an object-relational mapping is not like using an object database. Its feature include ACID support, Pluggable layered storage, Caching, Binary large objects (Blobs) and lot more.

Open Xml as Butter

This project aims to manage Document Templates ( .docx ) and their related data ; those data are divided into families, each of those families describe an area of a business activity. For Sales you will find Product , Customer, Sale, ... families. All of that is stored in ...

nitrite-database - Java embedded nosql document store

•    Java

NOsql Object (NO2 a.k.a Nitrite) database is an open source nosql embedded document store written in Java. It has MongoDB like API. It supports both in-memory and single file based persistent store powered by MVStore engine of h2 database. Nitrite is a server-less embedded database ideal for desktop, mobile or small web applications.

zoodb - ZooDB Object Database

•    Java

ZooDB Java JDO Object Database.