Open source object-relational mapping framework for ADO.NET.
Ranked in these QuestionsQuestion Ranking
Pro Migrations API
List all versions of a schema, apply one or go back to a previous version.
Pro Database support
Supports most popular databases.
Better than the chaotic and confusing NHibernate documentation.
Pro Database Agnostic
You can quite easily migrate from using one DB technology to another.
Pro Non intrusive object model
Object model is non-intrusive and consistent.
Pro Typesafe Queries
Linq2Sql allows writing queries using the actual ORM types. This prevents issues when modifying the schema/entities.
For simple data storage scenarios, EF may be unnecessarily complicated to learn.
Micro-ORMs have better performance.