3rd Party database Provider for Windows

Postgresql .Net data provider (Npgsql)
PostgreSQL OLE DB Provider (PgOleDb)
PostgreSQL ODBC Driver (psqlODBC)
PostgreSQL JDBC Driver

MySQL ADO.Net provider
unofficial: MySQL OLE DB Provider another: MyOleDB
MySQL Connector/ODBC
MySQL JDBC Driver
MySQL Visual Studio Plugin

ADO.NET 2.0 Provider for SQLite (System.Data.SQLite)
SQLite OLE DB Provider
SQLite ODBC Driver
SQLite JDBC Driver

Oracle Data Provider for .NET
Oracle Providers for ASP.NET
Oracle OLE DB Provider
Oracle ODBC Drivers for Windows
Oracle SQLJ/JDBC