Boxlin-1.3.0.jar is a release file of the Minecraft mod Boxlin, made for Minecraft 1.12.1, 1.12, 1.11, 1.11.1, 1.11.2, 1.12.2. It was published on March 18, 2018 and is 3.7 MB in size. For the full description, screenshots and every other version, visit the Boxlin mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.