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proton-bridge-android
Support scripts and patches for building and running ProtonBridge on Android in Termux
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k-9
Discontinued K-9 Mail – Open Source Email App for Android [Moved to: https://github.com/thundernest/k-9] (by k9mail)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There isn't really an easy way, but I did do a write up on using K-9 Mail with a self-hosted bridge and it's been great so far.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.