supertokens/supertokens-core
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
Open source alternative to Auth0
SuperTokens is an open source Java project by supertokens, created in January 2020. It has 15,331 stars and 787 forks on GitHub. Its most recent commit was on Oct 20, 2026, and it has 140 open issues, 1 of them labelled “good first issue”, which makes it a friendly place to start contributing. Its GitHub topics include authentication, session-management, login, and supertokens.
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