jon skeet 

Noda Time is a date and time API acting as an alternative to the built-in DateTime/DateTimeOffset etc types built into the .NET framework. It's based on the "engine" of Joda Time, the popular Java library - but... More information

Provides extra types which may be useful when testing code which uses Noda Time, such as a fake programmable implementation of IClock and a time zone which has a fixed transition. These types are also used to... More information

Provides serialization support between Noda Time and Json.NET.

MiscUtil is an "odds and ends" library with various utilities I've collected over the years. Note that this version is a pre-release containing the code which has been languishing for some time; before 1.0 is... More information

Helpful static methods (or extension methods) for enums and delegates, with constraints which can't be expressed in regular C#.

Simple micro-benchmarking framework

A Benchmarking Tool