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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.
Use [imapfilter](https://github.com/lefcha/imapfilter) to store the attachment in a local folder and delete/archive the mail. Then use something like [inotify](https://en.wikipedia.org/wiki/Inotify#:~:text=inotify%20(inode%20notify)%20is%20a,reports%20those%20changes%20to%20applications.)%20is%20a,reports%20those%20changes%20to%20applications.)) to run a script that sends the new pdf to the printer
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.