These 40 Open-source Tools Will Replace Half Your Tech Stack (And Some Tools are Free)

I curated 40 powerful, production-ready open-source tools that every serious developer should have in their toolbox.

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Let’s be honest — building great software today isn’t just about writing clean code. It’s about choosing the right tools that give you an unfair advantage. Over the past few months, I’ve been curating a list of under-the-radar, open-source projects that do exactly that. These aren’t your typical GitHub stars — they’re functional, production-ready gems you can plug into real-world applications.

1.AppFlowy — A Privacy-First Notion Alternative

If you’ve ever wished for a Notion-like workspace without the data lock-in, AppFlowy is your answer. It’s an open-source, extensible platform for organizing tasks, notes, and docs — but on your terms.

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What it does:
AppFlowy gives you the same productivity vibe as Notion, with full control over your data and codebase.