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I believe that Google still offers IMAP access (I think you need to set up app passwords, or possibly jump through some OAUTH hoops), letting you use something like imapfilter to set up rules, connecting to Gmail, then doing the filtering.
For CLI, looks like himalaya is a tool you looking for. It isnt filter, but just email client.
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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.