Borderless fullscreen is a wonderful thing.

A little tool for making games run in borderless fullscreen instead of windowed mode. Apps are displayed with a user-set filter to reduce needless clutter. Fullscreenizing apps is fully reversible to their initial settings, and multiple monitors are supported. A hotkey can be used instead of the UI. Configuration options are saved, and the hotkey can automatically enable upon startup.

See here for the available binaries.

This project was created around 2014/2015 and is not maintained.