TopMostFriend is a simple Open Source app that permits you to keep specific windows pinned to the top.
This app is simple in function in that it performs one thing, letting you quickly force any program to be always on top. With a right-click on the systray icon, you get access to the options for TopMostFriend. From there, you can configure the app to run as admin, select hotkeys, manage a blacklist, and more.
TopMostFriend provides a direct and simple approach to keeping selected windows up top, making it a good choice for any user level.