http://www.filehelpers.net
The FileHelpers are an easy to use .NET library written in C#. Is designed to read/write data from flat files with fixed length or delimited records (CSV). Also has support to import/export data from different data storages (Excel, Access, SqlServer)
Code on GitHub: https://github.com/MarcosMeli/FileHelpers
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The Tenor Framework is a set of utilities to improve development of web projects, although it can be used on desktop projects. The main goal is to simplify mapping relational tables to entities, in a simple and maintainable way.
DataLG is a Data Access Layer (DAL) generator. Create stored procedures, views, and tables on the database side, then use DataLG to create an assembly (and its source) to interact with them. Works with: Ms Sql Server, Sqlite 3, Mysql 4-5, and PostgreSQL.
SQLite client synchronization provider for Microsoft Sync Framework. Can be used as a replacement for the standard SQLCeClientSyncProvider. Note: This library depends on System.Data.Sqlite (http://sqlite.phxsoftware.com/).
BizBlox is a simple to use Object Relational Mapper API for .Net. On top of the usual features you expect from an ORM it provides native support for web services using transfer objects and partial transfer objects.
db4o is the world's leading open source object database for Java and .NET. Leverage fast native object persistence, ACID transactions, query-by-example, S.O.D.A object query API, automatic class schema evolution, small size (http://developer.db4o.com)
Framework for RAD against relational database. Supports multiple database platforms. Uses generics and partial classes. Includes a winforms Class Generatator for autogenerating O/R mapper classes based on Customisable templates.
aspbeans is a framework allowing translation between bean-like .NET objects and ASP web forms, allowing forms to be mapped to an object-oriented hierarchy (with relationships like many-to-one or one-to-one). Reduces coupling and makes developers happy.