ADO.NET PowerToys Project
The ADO.NET PowerToys Project is meant to provide a number of features for the working developer to do thier work better, easier and faster. Many of the features will be VS.NET add-ins to automate the process of dealing with ADO.NET. The initial feature set includes: An ADO.NET Utility Library of quick utility functions/classes; Improved DataSet Generator; Stored Procedure Wrapper Wizard.

Code Generator
Code Generator is a template based generator for any programming language like PHP, C#, Java... That takes as a source a database table, right now the supported Databases are MySQL, and SQL Server.

CodeGen
C# Source Code Generator for .NET - A very simple tool for automatic source code generation in C#.

Dingo
Dingo is a schema compiler for C#. It is designed to generate JXB style source using interfaces and concrete classes. Dingo currently supports the ability to extend a complexType with an external C# class. For example, say you want to use the schema in a GUI and it requires all classes implement a call back interface. Using a similar approach to Sun's JXB XJC, Dingo can add the interface to every class.

LLBLGen
LLBLGen, worlds number one data-access tier generator for .NET, generates a complete data-tier (both .NET classes (in C# or VB.NET) and all necessary stored procedures) for a given SQLServer 7/2000 database, including the compatible MSDE versions.

m3rlin
m3rlin is a templating code generator that uses ASP.NET style <% %> syntax. It hosts the ASP.NET runtime to perform the code generation. It uses XML as it's source of meta-data. Complete source as well as a binary for framework 1.0 and 1.1 is included, as well as some documentation and a simple demo (generating ASP.NET from SQL Schema in VB).

NCodeGen
NCodeGen is a code generation framework that can be used with any template engine.

n-orca
.NET – Object Relational Component Architecture (N-ORCA) is an architecture and framework for generating a robust middle-tier in any .NET language that stores persistent data in a relational database.

ORM.NET
ORM.NET : Object-Relational Mapping and Code Generation Tool for .NET

Sooda
Sooda (Simple Object-Oriented Data Access) is an Object-To-Relational Mapping software for the .NET environment. It lets you automatically generate an object-oriented data access layer (DAL) for your application. Instead of writing SQL code, you can now focus on writing business rules in object-oriented .NET languages.