OpenWebStart

OpenWebStart is an open‑source reimplementation of the Java Web Start technology that enables the execution of JNLP files using current Java runtimes. It restores the ability to launch Java Web Start‑based applications after Oracle removed the original JWS component from JDK 11 and later versions, allowing users with up‑to‑date Java installations to run legacy JNLP applications without modification.

The software targets developers and organizations that still rely on Java Web Start for deploying desktop applications, particularly those needing compatibility with newer Java releases. It provides the core features of the original JWS and JNLP specifications, and it is distributed for macOS among other platforms. OpenWebStart is maintained as a stable product, with community‑driven updates and optional paid support plans for enterprises seeking guaranteed fixes and dedicated assistance.

Updates to both the Java runtime and OpenWebStart itself are delivered through its support infrastructure, ensuring continued functionality as the Java ecosystem evolves. The project is free to use under an open‑source license, with additional support options available for commercial users.