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eLabFTW
:notebook: eLabFTW is the most popular open source electronic lab notebook for research labs.
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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.
Yes eLabFTW is a great electronic lab notebook. But it's better to have it installed at the institution level, like many universities and research centers do. Installing it for your group only at the beginning is a valid option, too. The other comments only mention proprietary software. eLabFTW is fully open source, and I think it's important to mention.
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.