Mikey Sklar did a great job with his example to connect the Muse headband to a LSL on a Raperri PI:

https://blog.adafruit.com/2018/05/28/recording-brainwaves-with-a-raspberry-pi/

LSL is great to connect to research grade software, for instance Arnaud Delormes Neurofeedbacklab:

https://github.com/arnodelorme/neurofeedbacklab

but what would be helpful for research applications would be to integrate all relevant data into one (Influx) Database. The Muse headband has been demonstrated that it can be used for research applications by Arnaud Delorme, EEGLAB developer from the Swartz Center of Computational Neuroscience:

Also the Polar OH1 heart rate sensor has been demonstrated to be a research grate device, as far as accuracy is concerned:

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288

Adafruit IO is interesting, but has yet to prove that it is suitable for research purposes:

200.01 How to read out data from the Adafruit Clue Pyloton?

I miss an application which integrates Muse Headband sensor data and Polar OH1 optical heart rate sensor into one application. LSL is great for research applications and there are options for the Muse Headband and LSL. But how to stream Polar OH1 sensor data into a research grade application?