Advanced Data Provider (ADP)
The Advanced Data Provider - ADP, is a transparent factory for ADO.NET which loads providers dynamically. It is written in C# and works on .NET, Portable.NET and Mono on Linux and Windows.
Firebird ADO.NET
The .NET data provider is written in C# and provides a high-performance native implementation of the GDS32/API functions. This means that .Net developers can access Firebird databases without needing to install the Firebird client.
MySQL Connector/Net
MySQL Connector/Net is an ADO.NET driver for MySQL.
PgSqlClient
PgSqlClient is an ADO.NET Data provider for PostgreSQL 7.4+ written in C#, 100% managed code, for use with MS .NET and Mono:: platforms, with support for the 3.0 protocol of PostgreSQL.