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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.
You can do this with themes. There is a theme modification so that anything you type between %% can be notes or comments about the task. When you leave the task it will "hide" the comments. The easiest thing to do is to download one of the user-created themes. I use jgclark, his toothpaste and tooth-bleach themes have the comment capability implemented. To learn how to customize themes watch this video.
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.