You're right, Allemano! Even if the answer for the first one should have been posted in its original place
Ok, here it is some information, I've managed to find:
Kometa-2 (4th picture) was by L. Cheretaev (Л. Черетаев) and it is powered by ZAZ 965. As far as I understand, it was a modified version of the Kometa-1, about which I know nothing.
Tech specs: Maximum power: 23 hp
Length: 3680 mm
Width: 1450 mm
Height: 1320 mm
Wheelbase: 2020 mm
Top speed (fully loaded): 90 km/h
There was also another Kometa (by N. Osipov (Н. Осипов)), which is unrelated with this Kometa-2, as far as I know.
As correctly identified, car in the first picture is name
Trud.
It was built by Oleg Kucherenko (Олег Кучеренко) and was powered by IMZ M-61 motorcycle engine.
The car in the picture #5 is indeed Poni built by A. Razgajlov (А. Разгайлов). Unfortunately, I know nothing more about it.
Finally, the car in the last picture is named
Truzhenik (Труженик) and was created by V. Fomin (В. Фомин). No more information about this, as well.
What concerns the other cars, they are real mystries for me. I have no idea abou the cars in the 2nd, 3rd and 5th pictures. However, the car #2 probably is standing right next to the Truzhenik in the attached picture.
In the second picture you can also see a boat with the wheels. It is an amphibian
Lastochka (Ласточка) = Swallow and was built by B. Bovikin (B. Бовыкин). I'm adding the drawings of this car.
Tech specs:Length: 4250 mm
Width: 1400 mm
Height: 1300 mm
Wheelbase: 2650 mm
Weight: 160 kg
Seating places: 3
Engine: motoroller Tula T200
Top speed: 50-60 km/h (land) and 12-15 km/h (on water)
As a bonus, I'm also adding a couple of atmosphere pictures of the 1969 parade. Enjoy!