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Here are 10 GitHub repos that quietly print money while you sleep. 1. Cal. com Open-source Calendly. Fork it, white-label it, sell to dentists and lawyers for $200/month. The founders hit $5M ARR in 3 years doing exactly this. Repo → <a target="_blank" href="https://github.com/calcom/cal.com" color="blue">github.com/calcom/cal.com</a> 2. Plausible Analytics Privacy-first Google Analytics. Self-host it, resell to agencies for $50/month per client. Two founders bootstrapped this to 7 figures. Repo → <a target="_blank" href="https://github.com/plausible/analytics" color="blue">github.com/plausible/anal…</a> 3. Ghost Open-source Substack with 100% margin. 1,000 readers at $5/month equals $60,000 a year. Forever. Repo → <a target="_blank" href="https://github.com/TryGhost/Ghost" color="blue">github.com/TryGhost/Ghost</a> 4. n8n Open-source Zapier. Sell automation services for $500-$2,000 per setup. n8n raised $14M because the agency model behind it works. Repo → <a target="_blank" href="https://github.com/n8n-io/n8n" color="blue">github.com/n8n-io/n8n</a> 5. Supabase Free Firebase replacement. Build a SaaS in a weekend, charge $29-$99/month. They raised $116M for a reason. Repo → <a target="_blank" href="https://github.com/supabase/supabase" color="blue">github.com/supabase/supab…</a> 6. Medusa Open-source Shopify. Take 5% on every sale forever. Zero rev share to Shopify. Repo → <a target="_blank" href="https://github.com/medusajs/medusa" color="blue">github.com/medusajs/medusa</a> 7. AppFlowy Open-source Notion. Sell self-hosted to enterprises worried about data privacy. They raised $30M because this market is massive. Repo → <a target="_blank" href="https://github.com/AppFlowy-IO/AppFlowy" color="blue">github.com/AppFlowy-IO/Ap…</a> 8. Coolify Open-source Vercel and Heroku. Charge developers $20/month to manage their deployments. Replace their $200 Vercel bill. Repo → <a target="_blank" href="https://github.com/coollabsio/coolify" color="blue">github.com/coollabsio/coo…</a> 9. Listmonk Open-source Mailchimp. Send unlimited emails for the cost of an AWS bill. Resell to agencies at 10x markup. Repo → <a target="_blank" href="https://github.com/knadh/listmonk" color="blue">github.com/knadh/listmonk</a> 10. Penpot Open-source Figma. Sell self-hosted design tools to agencies who refuse to upload client files to the cloud. Repo → <a target="_blank" href="https://github.com/penpot/penpot" color="blue">github.com/penpot/penpot</a> The difference between developers who build features and developers who build businesses is one decision. Pick one of these. Fork it this weekend. Ship it next week. The founders behind these repos already proved the model. Save this. Share it with the developer in your life who deserves to break free. 100% free. 100% open source.
