Npgsql is the .NET data provider for PostgreSQL
Async MySQL Connector for .NET and .NET Core
BearDB Database
Fastest and most reliable database connectivity solutions for any DB
Firebird ADO.NET Provider For VBA & VB6
Provides data access for data sources exposed through OLE DB.
A feature-rich and high-performance data access components for MS SQL
A feature-rich and high-performance data access components for Oracle
This is complete Firebird DDEX Provider for Visual Studio.