Athena (from https://comparers.codeplex.com/)
Upgraded to VS2013, removing support for older platforms.
Fixed NuGet platform tags.
Moved to new PCL.
Added non-generic IFullComparer.
Added readme to solution.
Added "descending" parameter to OrderBy/ThenBy.
Fixed longstanding bug where the default comparer for IEnumerable<T> was not automatically determined.
Updated primary nuspec (removing code contracts dll).
Integrated WPA support for Rx. Cleaned up nuspecs.
More cleaning up of build/nuspec files.
Clarified release notes.
Brought EqualityComparers into full parity with Comparers (added IFullEqualityComparer<T>, better default determination, etc).
Added ForElementsOf overload for passing sequence directly.
Added VS2012 build system for old platforms.