AxpDataGrid for ASP.NET: A datagrid with data editing capabilities in form mode.
Bean Software Search Control: ASP.NET web custom control, intended for web developers add searching database features to their web sites.
DataForm.NET: Enables use in application complex data entry forms without writing a single line of source code. It support SQL Server and Oracle.
DataObjects.NET: DataObjects.NET is object-to-database persistence layer for .NET Framework. By X-tensive.com.
db4o: Client/server object database for .NET and .NET CompactFramework.
DBNavigator: An open source .NET control that has a VCR-like interface for navigating data and managing records.
Deli: The intelligent data access layer, connects .NET components to relational databases with little or no code changes and no code generation. By Revelation Technologies.
Dharma .NET SDK: A rapid to implement SDK to provide high-end SQL functionality and performance to proprietary or legacy data source.
Directory of .NET Data Providers: List of vendors and authors of .NET data providers.
eXport.NET: A specially designed .NET component for quickly and efficiently exporting data into various formats. By SeriousFish Ltd.
Gentle.NET Object Persistence Framework: Automatic SQL generation and object construction. Supports PostgreSQL, MySQL, MS SQL Server, and SQLite.
JC Persistent Framework: Open Source O/R Database Mapping Layer based on Scott Amblers design.
MetaBase.NET: A proxy-caching database server optimized for the .NET environment. It supports Oracle, SQL Server, DB2, PostGreSQL, FireBird, and MySql. By JHOB Technologies.
MySQL .NET: Data Provider for direct access to MySQL database. By Core Lab.
Objectz.NET: An Object-Relational (O/R) mapping and persistence library for the .NET platform.
OraDirect .NET: Data Provider for direct access to Oracle database. By Core Lab.
Potis Port: Automate translation of information between business objects model and relational database tables for Visual Studio.NET.
Proposion N2N: Managed ADO.NET data driver for Lotus Domino. Integrates Lotus Domino into the .NET Framework.
Sql.Net: A software software component which allows programmatically create SQL queries in runtime using a convenient .Net Object Model, thus creating an abstraction layer over SQL. [Open source, GPL]
SQLite: ADO.NET 2.0 Provider for SQLite with VS 2005 design-time support. Available for standard and Compact Framework. Downloads and a forum are available.
TurboDB.NET: A full-sized ADO.NET data provider featuring the Connection, Command, DataReader, DataAdapter and CommandBuilder components. Apart from the connection string, you should be able to use the same database code for OleDb and TurboDB data access.
VistaDB: Embedded SQL database alternative to Jet, MSDE and SQL Server Express for building small to midsize .NET database applications.