Freedom251 › Minecraft Launchers
OpenJar Launcher
What OpenJar Launcher is
OpenJar Launcher is a Mac-first Minecraft launcher and modding toolkit for organizing instances, modpacks, mods, configurations, and launches. Each instance keeps its mods, configs, worlds, launch settings, and metadata in a separate folder on disk. Users can browse content from Modrinth, CurseForge, and GitHub, and import Modrinth .mrpack files, CurseForge modpack ZIPs, Vanilla Minecraft, or Prism Launcher instances. Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All. Creator Studio builds layered modpacks and previews planned changes; run reports and Fix My Instance surface likely causes and reversible recovery actions. Friend Link is intended for small groups, but its first version has no hosted cloud relay or world-save replication. Data stays local by default; network use is for provider, authentication, update, and sync flows users choose. Production builds store refresh tokens in OS secure storage. Build targets cover macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64, with the most manual testing on macOS. The source-available license permits personal and non-commercial use; commercial use requires written permission.
Who it suits
It suits Minecraft players who want separated instances and modpack management across supported desktop systems. It may also suit modpack creators who want layered packs and previews, provided their use is personal or non-commercial unless they obtain written permission.
What it does well
- Separate on-disk folders for each instance.
- Integrates with Modrinth, CurseForge, and GitHub.
- Imports modpacks and Vanilla or Prism instances.
- Rollback snapshots are available before Update All.
- Refresh tokens use OS secure storage in production builds.
What to know first
- Friend Link lacks hosted relay and world-save replication in v1.
- Commercial use requires written permission.
- macOS receives the most manual testing.
Limits
The free plan is limited to personal and non-commercial use; commercial use requires written permission. Friend Link has no hosted cloud relay or world-save replication in v1.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| OpenJar Launcher | Personal and non-commercial use; commercial use requires written permission | Free |
As github.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Getting started
- Open the OpenJar Launcher project website on GitHub
- Choose a build for macOS, Linux, or Windows
- Install and launch OpenJar
- Browse the built-in catalog or connect to Modrinth, CurseForge, or GitHub
- Create an instance or import a supported modpack or Minecraft setup
Verdict
OpenJar brings instance, pack, update, and troubleshooting tools together, while keeping data local by default. Note the limited Friend Link scope and the license restriction on commercial use.
Questions
How much does OpenJar Launcher cost?
The listed plan is free. It is for personal and non-commercial use; commercial use requires written permission.
Which operating systems does it support?
Build targets include macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64. macOS receives the most manual testing.
Can it import existing modpacks or Minecraft instances?
Yes. It can import Modrinth .mrpack and CurseForge modpack ZIP archives, as well as Vanilla Minecraft and Prism Launcher instances.
Where does OpenJar keep game data?
Each instance has its own normal on-disk folder for its mods, configurations, worlds, launch settings, and metadata. Instances, worlds, configs, and saves are not uploaded by default.
Can I use OpenJar commercially?
The source-available license permits personal and non-commercial use. Commercial use requires written permission.
Facts from OpenJar Launcher's own pages
- Automatic updates
- Yes · github.com, 22 Sept 2026
- Built-in modpack catalog
- Yes · github.com, 22 Sept 2026
- Creator Studio
- Creator Studio builds layered modpacks and previews planned changes before applying them. · github.com, 11 Oct 2026
- Credential security
- Production builds store refresh tokens in OS secure storage, and the project says they do not intentionally fall back to plaintext token storage. · github.com, 11 Oct 2026
- Free plan
- Yes · github.com, 22 Sept 2026
- Friend Link limit
- Friend Link is designed for small groups and has no hosted cloud relay or world-save replication in v1. · github.com, 11 Oct 2026
- Instances
- It keeps each Minecraft setup in its own normal on-disk folder with separate mods, configs, worlds, launch settings, and metadata. · github.com, 11 Oct 2026
- Java runtime management
- Yes · github.com, 22 Sept 2026
- License restriction
- The source-available license permits personal and non-commercial use but prohibits redistribution or commercial use without written permission. · github.com, 11 Oct 2026
- Local-first data
- Instances, worlds, configs, and saves are not uploaded by default; network use is for provider, authentication, update, and sync flows the user chooses. · github.com, 11 Oct 2026
- Maintenance
- Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All. · github.com, 11 Oct 2026
- Modpack import
- both · github.com, 22 Sept 2026
- Pack imports
- It can import Modrinth .mrpack and CurseForge modpack ZIP archives, plus Vanilla Minecraft and Prism Launcher instances. · github.com, 11 Oct 2026
- Platform support
- Build targets include macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64; macOS receives the most manual testing. · github.com, 11 Oct 2026
- Provider integrations
- It supports browsing and installing content from Modrinth, CurseForge, and GitHub. · github.com, 11 Oct 2026
- Purpose
- OpenJar is a Mac-first Minecraft launcher and modding toolkit for managing instances, modpacks, mods, configs, and launches. · github.com, 11 Oct 2026
- Separate instances
- Yes · github.com, 22 Sept 2026
- Support
- The README asks users who encounter Windows or Linux issues to open a GitHub issue with OS version, architecture, reproduction steps, and relevant errors or logs. · github.com, 11 Oct 2026
- Troubleshooting
- Run reports and Fix My Instance surface likely causes, recent changes, and reversible recovery actions. · github.com, 11 Oct 2026
Where OpenJar Launcher stands on Freedom251
- Minecraft Launchers#12 of 76