Help identifying Star Wars set from troopers and white pieces
Seems to be mostly from one set with a mixture of Minifigs and accessories.

Set #10195-1 Republic Dropship with AT-OT.  (Referencing your picture, these are generally the bricks below your Minifigs.)



Some Minifigs and accessories. 

Set #8084-1 Snowtrooper Battle Pack. (Referencing your picture, some of your Minifigs come from this set.)



Headgear: Part 61182 Minifigure, Headgear Helmet SW Rebel Scout Trooper. ( Comes with a black visor shown in your picture.  Headgear used on the figure directly below, which is NOT in your picture.)





Trans-Neon Light Saber: Part #30374 Bar 4L (Lightsaber Blade / Wand).



Chrome Hilt: Part #64567 Minifigure, Weapon Lightsaber Hilt Straight.



Minifig: Part #sw0178 General Maximillian Veers - Goggles Print and Dark Bluish Gray Helmet.



Minifig: Part #Sw0166 Shadow Trooper.