psql -U shawsome

PostGIS adds support for geographic objects to the PostgreSQL object-relational database. In effect, PostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for geographic information systems (GIS), much like ESRI's SDE or Oracle's Spatial extension.

WordNet® is a large lexical database of English, developed under the direction of George A. Miller (Emeritus). Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.

Sterling is a lightweight object-oriented database implementation for Silverlight and Windows Phone 7 that works with your existing class structures. Sterling supports full LINQ to Object queries over keys and indexes for fast retrieval of information from large data sets.

Ninja is a Light and nimble database for Windows Phone 7. It is under 100KB and is built for high performance.  Easily save and load any public object to isolated storage.

siaqodb is an object database engine that currently runs on .NET 3.5+, Mono 2.4+, Silverlight 3 and 4 as well as WP7. It’s database management application allows you to use LINQ to run ad-hoc queries against the database, which is kind of a cool and unique feature.

db4o is an object-based database (as opposed to a relational database) designed for use in Silverlight and .NET applications. Since there is Silverlight 3 support, it *should* work on WP7.

Embeddable database for Windows Phone 7. $395 for commercial apps.

This project implements a Isolated Storage (IsolatedStorage) based database for Windows Phone 7. The database consists of table objects, each one supporting any number of columns.