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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.
TaskWarrior might be your thing. See https://taskwarrior.org or r/taskwarrior
Emacs is a plain-text editor with a built-in programming language, which makes it infinitely extensible. The official website where you can download it and read more is at https://www.gnu.org/software/emacs/
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.