My managed memory concept has one goal: to make heap memory that uses external resources safer. It does this by wrapping up the given type and become very opinionated about what you can do with it. Most of the time it should be out of the way, right until you do something wrong.
My library SPEW, has one goal: Abstract away hard difficult system dependent systems that is used in almost every application and retain excellent performance. All the while being heavily extendable. It covers windowing, sockets and timers. Of which only windowing has been designed and implemented.