Jacinth Entity System, by Aravol
The Jacinth Entity System is an Entity System (otherwise known as an Entity-Component System) wirtten in C#, with primary design goals of managed implementation, freeform multithreading support, and overall platform stability. For more information on design goals, implementations, and documentation, see the Jacinth Wiki on GitHub.
Currently, Jacinth is written against Visual Studio 2015 Express Edition and does not rely on any assemblies outside the core .NET assemblies. Thus, Jacinth should not require any additional setup beyond cloning, openning Jacinth.sln, and building. Any failure of this operation should be reported as a bug.