Open-Source Tools Built With Java (2026)
Self-hostable software written in Java.
If you prefer to run software written in Java — for easier auditing, contributing, or self-hosting on a stack your team already knows — these 2 open and self-hostable tools are built with it. Java projects tend to be easy to deploy alongside the rest of your Java infrastructure.
Battle-tested open-source identity and access management with SSO, OIDC, and SAML.
Open sourceSelf-hostFree / self-hostApache-2.023.5k★
- Apache-2.0 licensed — completely free with no seat or MAU limits
- CNCF-incubating project with Red Hat backing and a decade of production hardening
- Java-based stack is resource-heavy and slow to cold-start compared to modern alternatives
Open-source authentication with session management, social login, and passwordless — self-host or managed.
Open sourceSelf-hostFree / self-hostApache-2.013.8k★
- Apache-2.0 licensed core is free to self-host with no MAU or seat limits
- Recipe-based architecture lets you mix and match auth methods modularly
- Enterprise features like SAML SSO and SCIM provisioning require the paid managed plan