Add Crypto Tracker
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https://taoteh1221.github.io/
https://github.com/taoteh1221/Open_Crypto_TrackerSeems to be a good tool, completely open source (and free) to configure various things about crypto, including alerting of crypto markets (which are paid features in most places).
Just for alerts, this tool would be useful. But it does a lot of other things which might interest even more people.
It also runs on Raspberry PI.