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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.
It currently has iCloud sync and external source support, and sources can be installed in-app (only MangaDex and MangaSee sources exist right now, but more can be made in the future). There are no ads, and it's open source on GitHub.
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.