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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.
I've been trying out a TON of GTD-related apps over the years and recently settled on tasks.org to complement Google Tasks. Honestly, this is an amazing app, but it lacks features that I really want: A Web interface and integration with other applications. Then a week ago, I moved to Todoist, and while it worked great and provided much of what I wanted, its free account limitations were apparent. Bummer, as I didn't want to pay what they ask for a premium account.
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.