Metrics.NET by Recognos
The Metrics.NET library provides a way of instrumenting applications with custom metrics (timers, histograms, counters etc) that can be reported in various ways and can provide insights on what is happening inside a running application.
created at March 4, 2016, 3:21 p.m.
DocNet by FransBouma
Your friendly static documentation generator, using markdown files to build the content.
created at Feb. 10, 2016, 10:54 a.m.
peachpie by peachpiecompiler
PeachPie - the PHP compiler and runtime for .NET and .NET Core
created at Feb. 5, 2016, 4:22 p.m.
TomsToolbox by tom-englert
A set of core functions and classes to ease every days .Net development tasks.
created at Feb. 1, 2016, 6:23 p.m.
Websockets.PCL by NVentimiglia
C# Websockets for all platforms using native bridges
created at Jan. 30, 2016, 10:55 p.m.
sonarlint-visualstudio by SonarSource
SonarLint extension for VisualStudio
created at Jan. 27, 2016, 1:44 p.m.
Compare-Net-Objects by GregFinzer
What you have been waiting for 
Perform a deep compare of any two .NET objects using reflection. Shows the differences between the two objects.
created at Jan. 23, 2016, 6:21 p.m.
atata by atata-framework
C#/.NET test automation framework for web
created at Jan. 13, 2016, 12:54 p.m.
OneOf by mcintyre321
Easy to use F#-like ~discriminated~ unions for C# with exhaustive compile time matching
created at Jan. 12, 2016, 10:31 p.m.
Fable by fable-compiler
F# to JavaScript, TypeScript, Python, Rust and Dart Compiler
created at Jan. 11, 2016, 10:10 a.m.
OpenLiveWriter by OpenLiveWriter
An open source fork of Windows Live Writer
created at Dec. 9, 2015, 8:43 a.m.
jurassic by paulbartrum
A .NET library to parse and execute JavaScript code.
created at Nov. 26, 2015, 7:18 a.m.
DocX by xceedsoftware
Fast and easy to use .NET library that creates or modifies Microsoft Word files without installing Word.
created at Nov. 22, 2015, 12:48 p.m.