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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 is DroneDB, it's open source project, and you can self-host, or open up projects locally for free. I also believe it has a cloud service that has a few Gb free, but for bigger projects you would have to buy it. It's pretty ok from my experience, but I'm not sure if you can have annotations, I believe it uses similar libraries as WebODM.
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.