Description
ATTENTION: This mod is no longer being maintained by McHorse. It is now maintained by Chryfi. There are still going to be official updates by Chryfi and other contributors and there have been task forces that are investigating on porting it. If you also want to contribute to official updates, or to the porting effort, please join the official McHorse's Discord server, so we can communicate with you. Check out the source code.

CurseForge page – GitHub – Wiki
Mappet is a Minecraft mod (for 1.12.2 exclusively) that is designed as a tool set for far superior adventure maps than possible with vanilla. It's also possible to use Mappet for scripted roleplays, and, to some extent, in Minecraft machinimas.
Special thanks to Andruxioid for the mod's name, Jvonlins, Centryfuga and CustomNPCs Forever Vkontakte group for testing, suggestions and directing!
Install
Install Minecraft Forge, download the latest stable version of jar file for available Minecraft version. Also install following mods: McLib, Metamorph, and Blockbuster. Put it in minecraft's mods folder, and launch the game.
After that, Mappet mod should be installed and will appear in Minecraft's mods menu. If Mappet didn't appear in the mods menu, then something went wrong.
Scripting
Mappet features scripting API, which allows program game logic within Minecraft using JS (ES5 by default) or Kotlin scripts. For more information, visit Mappet wiki's page about scripts.
JavaScript (ES5)
For JS scripts to work, you would need to get Nashorn jar (which is located in Java's (JRE/JDK) home folder by path lib/ext/nashorn.jar) into Minecraft's mods folder.
If you're already If you're already using CustomNPCs mod with Mappet, you don't need to do this. If you use GraalVM instead of Oracle's Java or OpenJDK, scripts should work without Nashorn due to GraalJS.
Kotlin scripts
For Kotlin scripts to work, you would need Mappet 0.3+ and to download this fat jar and place it in Minecraft's mods folder. By default, scripts are assumed to be using JS.
To make your script use Kotlin scripting, you need re/name your script ending with .kts, then instead of JS scripting engine, Kotlin scripting would be used.
Resources
At the moment, the mod is still in development, however, here is a playlist of videos that cover some Mappet mod's features:
Alternatively, there is an almost complete wiki describing all Mappet's mechanics. If you'll have questions about the mod, you can also join Mappet's Discord server.
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What means Verified?
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Compatibility: The mod should be compatible with the latest version of Minecraft and be clearly labeled with its supported versions.
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Functionality: The mod should work as advertised and not cause any game-breaking bugs or crashes.
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Security: The mod should not contain any malicious code or attempts to steal personal information.
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Performance: The mod should not cause a significant decrease in the game's performance, such as by causing lag or reducing frame rates.
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Originality: The mod should be original and not a copy of someone else's work.
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Up-to-date: The mod should be regularly updated to fix bugs, improve performance, and maintain compatibility with the latest version of Minecraft.
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Support: The mod should have an active developer who provides support and troubleshooting assistance to users.
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License: The mod should be released under a clear and open source license that allows others to use, modify, and redistribute the code.
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Documentation: The mod should come with clear and detailed documentation on how to install and use it.
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How to Install
Download Forge & Java
Download Forge from the offical Site or here. If you dont have Java installed then install it now from here. After Downloading Forge you can run the file with Java.
Prepare
Lounch Minecraft and select your Forge istallation as Version this will create a Folder called Mods.
Add Mods
Type Win+R and type %appdata% and open the .minecraft Folder. There will you find your Folder called Mods. Place all Mods you want to play in this Folder
Enjoy
You are now Ready. Re-start your Game and start Playing.