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List of Alternatives to Adobe Programs
(feddit.org)
This is a most excellent place for technology news and articles.
Yeah the PDF category is weird / lacking. LibreOffice Draw and Inkscape can both edit PDFs and are missing as well. Xodo looks like some mobile app only or SaaS product.
Edit: Xodo does have a free desktop PDF reader but seems like they're certainly focused on selling their subscription based PDF editor