I just made a program for overlaying NightBot's current playing song on your stream because I couldn't find anything else which did this.
It works with any streaming software which allows for text to be read from a file and so works with OBS, XSplit, etc.
For example, here's how to use it in OBS :
1. Create a Text source
2. In the source's properties, check "Read from file"
3. For the "Text file" field, browse to the folder where you installed the program, and select np.txt
The program and more details and stuff can be found here: https://github.com/pixelzerg/NightBotNowPlaying
Hope this is useful to somebody !