Useless

Useless stuff that you should use, but less.

NullFactory

You can create fresh nulls super efficiently like this:

var myNull = new NullFactory().Create();
var myTypedNull = new NullFactory().Create<MyClass>();

Tripleton

Use Tripleton to create a class that can only ever have three instances. You will be (psuedo)randomly returned one of the three instances. According to my rough calculations, this class is three times better than a Singleton.

class MyTripleton : Tripleton<MyTripleton>
{
}

MyTripleton aRandomInstance = MyTripleton.Instance;
MyTripleton anotherRandomInstance = MyTripleton.Instance;

FactoryFactory

Use FactoryFactory to create a factory for any type you want.

var intFactoryFactory = new FactoryFactory<int>();
var myIntFactory = intFactoryFactory.Create();

var int1 = myIntFactory.Create();
var int2 = myIntFactory.Create();