No. 3 is an Italeri M4A1 Sherman.

No. 7 is a Tamiya Sd.Kfz. 222 (with the turret hatches glued on the wrong way round  ).

In No. 11, the little diorama at top left is from the Matchbox Humber armoured car.

In Nos. 12 and 13, I see a Matchbox Wespe, Sd.Kfz. 232, Sd.Kfz. 234 "Puma", an M16 halftrack, and probably an Sd.Kfz. 251 as well. The T-34 may also be a Matchbox kit, I'm not sure.