Something to generate rf or other energy through the transfer of aura between chunks (or maybe between dimensions, such as between the nether and the end making a high net return, or something?).
Tesla creative flight jetpacks with two spinning disks. Al-chemistry for potion creation using alien ingredients.
Processing of Plassein blooms, Plassein trees, and various ores/veins into usable metal for machinery.
Laser-like ether, and chunk based aura (might be coming sooner, rather than later).
Update as we continue to have ideas.