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localpdfmerger
Merge PDFs, optimize PDFs, and extract Information like Images from PDF Files locally inside your Browser
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pdfarranger
Small python-gtk application, which helps the user to merge or split PDF documents and rotate, crop and rearrange their pages using an interactive and intuitive graphical interface.
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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.
https://smallpdf.com/ https://online2pdf.com/ https://localpdf.tech/ (this one doesn't even leave your local network)
underrated foss https://github.com/pdfarranger/pdfarranger
NOTE:
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Hence, a higher number means a more popular project.