Just Enough Immersive Multiblocks

Simple Immersive Engineering addon that adds JEI support for multiblocks. Supports structures from Immersive Engineering as well as most addons like Immersive Petroleum, if installed.

Multiblocks show up in JEI search, allowing easy lookup of multiblocks. These are also linked to the "catalyst" ingedients for each multiblock's recipes and can be navigated directly.

Multiblock recipes show basic structure and ingredients. While not intended as a full replacement for the Engineer's Manual, this makes it easier to look up recipes for input blocks with a single click.

Arc Furnace

Also supports EMI as a first-class plugin (Minecraft 1.20.1+), no compatibility loaders required.

Specific version notes

1.20.1

Huge thanks to FLORIAN4600 for overcoming some nasty lifecycle issues and allowing this mod to live on into 1.20+ of Minecraft
Thank you Pengy for EMI support

1.16

This mod has known issues in 1.16 and should be considered single-player-only

Anything older than 1.16

Backports to older versions will not happen. Please do not ask unless you personally are prepared to do the port and maintain it.
Independent backport to 1.12.2 exists as Rather Enough Immersive Multiblocks