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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.
If you're looking for "planning" features (as in project planning?), have a look at OpenProject. Maybe not exactly what you're looking for as this is something that should be installed on a server. But once you did that, you can access it from everywhere. If you don't want to install it yourself, you can buy their cloud service instead.
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.