anjdreas 

Units.NET gives you all the common units of measurement and the conversions between them. It is light-weight, unit tested and supports PCL.

Human friendly, textual representations of TimeSpan and file size using standard .NET types. It is light-weight, tested and supports PCL.

Log the raw HTTP requests and responses of your ASP.NET WebApi and WebApi2.

Light-weight and portable logging interface. Combine with existing PortableLog adapters for logging frameworks or write your own.

Wire up your logging with the NLog logging framework.

Compare operating system versions, check if OS is 32/64-bit and what service pack is installed.