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Onyx Launcher is an open-source Minecraft launcher for Windows and Linux, developed and maintained by the Onyx Launcher contributors. Its purpose is to simplify the setup, organization, and maintenance of Minecraft installations by managing isolated game instances, so that each configuration of the game remains separate and unaffected by changes made to others. The launcher supports Vanilla Minecraft as well as popular mod loaders, and it integrates directly with Modrinth, allowing users to browse and install Modrinth modpacks and mods from within the application. To remove one of the most common sources of setup difficulty, Onyx Launcher automatically provisions Eclipse Temurin Java runtimes, ensuring that each instance has the appropriate Java environment without requiring manual installation or configuration. For troubleshooting, the software includes crash diagnostics that help users identify the cause of game failures, while world snapshots and safe backups protect player progress and allow recovery from data loss or problematic changes. Per-instance performance settings give users control over resource allocation and other tuning options on a case-by-case basis. Typical use cases include players who run multiple modded and unmodified instances side by side, users who want a streamlined way to install and update Modrinth content, and those who need dependable backup and diagnostic tooling for long-running worlds. The software falls within the game launcher and game utility category, with a particular focus on mod management and instance isolation. The current version of Onyx Launcher is 1.6.3, and according to the available release information there is one published version of the software at this time. As an open-source project, Onyx Launcher is developed by its contributor community rather than a commercial publisher.
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