oh-my-minecraft-client-1.18-0.3.6.jar is a beta file of the Minecraft mod OMMC for Fabric, made for Minecraft 1.18-Snapshot. It was published on September 2, 2021 and is 1.9 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the OMMC mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.