Unity already provides a bunch of methods to perform the most tasks a lot faster. However, still there is a gap for some useful extensions. The extensions I came up with are listed below. In addition, you can find the .cs file as an attachment.
Some of the extensions are related to the game I am currently building. Thus, do not expect every extension to be a useful one.
For a faster access through the whole source-code, the „QuickAccess.cs“ provides some common functionality. It won’t compile, since it contains enums which aren’t attached to this thread.