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LibreOffice
Read-only LibreOffice core repo - no pull request (use gerrit instead https://gerrit.libreoffice.org/) - don't download zip, use https://dev-www.libreoffice.org/bundles/ instead (by LibreOffice)
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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.
Also if you are looking for a locally installed option there is https://www.libreoffice.org/
I would not trust anything done by Huawei to be secure. If you are looking for a lower cost office solution there is https://nextcloud.com/ which offers a really nice set of tools and a good team behind them doing the maintaining.
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.