When browsing these repositories, you will usually find three distinct elements:

Mojang (now Microsoft) has not officially endorsed or allowed Eaglercraft. However, due to the clean-room nature of many components and the requirement for a legitimate Minecraft JAR to build, it exists in a legal gray area.

Most repositories contain an offline folder or a stable release release section containing a single .html file. Go to the section of the GitHub repository. Download the eaglercraftX_1.12.2_offline.html file. Double-click the downloaded file on your computer.

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Example emcc command:

Run the bundled server java -jar EaglercraftServer.jar

References

Eaglercraft currently supports several Minecraft versions:

You'll be greeted by a profile screen where you can:

Example 3 — Adding a simple custom texture:

Wait for it to load (30–60 seconds on a slow connection), and you're ready to play.

GitHub is the primary hub for finding and hosting Eaglercraft projects. Here are some of the most relevant repositories:

A legitimate repository will feature a detailed layout explaining how to build the workspace or deploy the HTML client. How to Use GitHub Files to Play Eaglercraft 1.12.2

Includes 1.12 features like Concrete, Glazed Terracotta, and the Recipe Book.

[Source: 20†L16-L19]