This is the Moon Fang Tribe by Soren Roberts. Ijad, I presume?
The I-ST-o4E Super Strider by Soren Roberts. This looks to be the main ranged combat unit of the squad.
The I-ST-04EH Super Strider Artillery by Soren Roberts. The artillery unit of the squad.
I-ST-05B Slammer Solidblade by Soren Roberts. This looks to be the melee specialist of the squad.
I'd love to see the Mobile Frame Zero stats of these babies.
I have no idea who these are for but, they look great.