The T26s are Arrowhead and I have a few of these as still available for use with the FOW mid-war forces. I made one with the early turret for some variety.
T28 is Miniature Figurines (Minifigs). One of the few minifigs tanks I have kept hold of - like almost all their models it is a pain to clean up of flash etc. but looks nice when done. I will get some more once I work out how many I need.
T35 is a Panzer Depot model. One of their early ones so the paint job is not bad, although I gave it a weathering wash and some mud effect. If I need more of these I am not sure if I will go for Panzer Deport or Minfigs (much cheaper going the Minifigs route!).