Special tiers of parts like the "Alien Green Frame" can power devices without an engine or pig.
The developers of this mod (a small, anonymous team calling themselves "Team Verge") release a new "UPD" roughly every 6-8 weeks. Their public roadmap includes: bad piggies mod leading edge upd
Introduces an infinite building grid and unlimited parts, allowing for massive constructions that span entire maps. Special tiers of parts like the "Alien Green