A set of useful libraries for many kinds of .NET developers, starting with Loyc.Essentials, a library that "fills in the gaps" in the core of the .NET Base Class Library. LoycCore is especially focused on collections: classes, interfaces, adapters, and extension methods. Plus, Loyc.Syntax.dll parses LES, a superset of JSON that resembles C/C#/Java/Ecmascript/D, and runtime helper classes for the Loyc LL(k) parser generator.
Contributors are welcome: more unit tests, code reviews, and new features are desired, anything relatively small (under about 3000 lines of code) that fits the theme "things that should have been built into the .NET framework, but aren't".
See the version list below for details.