YamlDotNet by: Antoine Aubry

A .NET library for YAML. YamlDotNet provides low level parsing and emitting of YAML as well as a high level object model similar to XmlDocument.

YouTrackSharp by: JetBrains

A .NET Library to talk to JetBrains YouTrack.

ZedGraph by: ZedGraph Project

ZedGraph is a class library, user control, and web control for .net, written in C#, for drawing 2D Line, Bar, and Pie Charts. It features full, detailed customization capabilities, but most options have defaults for ease of use.

zlib.net by: Jean-loup Gailly, Mark Adler, ComponentAce

ZLIB.NET is a 100% managed version of ZLIB compression library which implements deflate and inflate compression algorithms (zlib format).