Did you have any specific gripes with the Mind Monitor app? The visualizations seem nice, but it would be interesting to see a feature that allows synchronization with other data sources. (e.g. connecting a keyboard to capture both neural activity and keystrokes simultaneously) That said, this might not be worth the effort. For me, obtaining high-quality data was a challenge, which I suspect is a common limitation of non-invasive electrodes.
You can export your data and work with it. Also, there are some online tools and docs [1][2]. Also, there are open source libs such as [3]. My only "gripe" is knowing enough about EEG.
[1] https://mind-monitor.com/Chart.php
[1] https://choosemuse.com/?srsltid=AfmBOopzyEsQF8LcBiGJD4U9fKRR...
[2] https://mind-monitor.com/