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1Anil-matcha / awesome-open-source-saas-alternativesOpen source alternatives to paid SaaS apps: Notion, Slack, Auth0, Vercel and more. Curated list with licenses and GitHub stars.JavaScriptUnknown · Restricted / unknownInsufficient rank history3,449518——2026-11-02

2authgear / authgear-serverOpen source Auth0/Keycloak alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile appsGoApache-2.0 · PermissiveInsufficient rank history2,139130——2026-11-02

3mixcore / mix.core🚀 A future-proof enterprise web CMS supporting both headless and decoupled approaches. Build any type of app with customizable APIs on ASP.NET Core/.NET Core. Completely open-source and designed for flexibility. Since 2018.C#MIT · PermissiveInsufficient rank history888223——2026-01-29

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