OBS Remote is a websocket based plugin/webclient for Open Broadcaster Software. Basically it enables you to control and monitor your stream in the browser from a remote computer. So if you use a second computer to stream or have a laptop but not a second monitor to stream from, OBS Remote will enable you to control your stream without having to alt + tab or interrupt your stream.
I have currently tested OBS Remote with Chrome, Firefox, Desktop Safari, and the Steam Browser. So other browsers might perform in an unpredictable way (or not at all if they don't support websockets.)
I recently released an Android client for OBS Remote. The app can be downloaded on the android play store.
OBS Remote is available for free and is released under GPLv2. I maintain the webclient and plugin code on GitHub. If you run into any issues please feel free to post issues on GitHub.