TypeCache is a fast alternative to System.Reflection. Also contained are IEnumerable extensions as an alternative to System.Linq, as well as a database access alternative to Dapper.

Useful extension methods for .NET.

IQueryable.Select by property names (EF compatible extensions)

C# library for simple extension methods for various types to ease writing clean code

Extensions to C# IEnumerables, ICollections, and more to improve them.