Turret Destroyers:
Incinerator;
a panel, fizzler and reversed tractor beam, placed in the wall to grab and then destroy turrets.
Laser Security System;
using the same technique as before, but with lasers instead of fizzlers and tractor beams.
PS: you can swap out some things for other things like, instead of a fizzler you can use a pit of goo.

Gel Things:
Gel Block Maker;
By using a block dispenser and some gel, you can make a gel block very useful. I recommend
putting them in the roof and using panels to conceal them.
Gel Cleaner;
Just a cleansing gel dispenser and a panel, nothing else (except maybe a button!)

Sorry This section is currently empty just tell me any tips and/or tricks in comments and i'll add them.