db4o Open Source Object Database
db4o is the native Java, .NET and Mono open source object database. The db4o object database engine consists of one single DLL. This is all that you need to program against. The versions supplied with the distribution can be found in /db4o-5.0/dll/. The structure of the other distributions may be considerably different, so please use the tutorial for the version that you plan to experiment with first. The included documentation was written for .NET.
Instructions: Click the link below to download the code. Select 'Save' from the IE popup dialog. Once downloaded, open the .zip file from your local drive using WinZip or a comparable program to view the contents.