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gofpdf is the classic choice: pure Go, dependency-free.
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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unipdf is a commercial-grade library. It's powerful, feature-rich, and paid for production — but free for personal and trial use.
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pdfcpu is more focused on editing, processing, and validating PDFs, but it can generate simple PDFs too.
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chromedp lets you programmatically control Chrome.
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.