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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.
Photoview with Photo Sync.
There is an ignoreDelete option available if you're willing to edit the configuration by hand, but it has side effects due to it going against the bidirectional-ness nature of the program.
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.