Portals, originally created by Bilka, now ported to 2.0!
Adds portals that can teleport players (and only players!). Build the portals using the portal gun: Left click for the orange portal, SHIFT+ Left click (ghost build) for the blue portal. Every player can have one set of portals which can be distinguished using the number next to the portal. Adds combustible lemons that work similiar to cluster grenades, just with fire. This mod can also be found on the forums.

Your mileage may vary- I have only tested this on Nauvis, and together with Factorissimo 2.
It Works on My Machine ( ͡° ͜ʖ ͡°), but be wary. Any bugs or concerns, please inform me.