First 2 are while running
3rd I added a little water (although many of you think water is a sin)
4th car is off
5th car is off foam settled
What do you guys think?

 

looks like stop leak and rust ... how does the oil look ... drain the coolant, flush it, refill it with a proper mix, and get it hot ... most of the time if it is a bad head/gasket water will leak into a cylinder when you shut it off if it is blowing into the coolant when it is running ... that will most of the time make it hydrolock the next time you go to start it and will often make it steam out the back when running ... just looks like it needs a good cleaning and has no antifreeze in it ... but check for milky oil, and pull the plugs to see if one looks like it has been steam cleaned ... if you have either of those things, i would then suspect the gasket or head

 

also, you may find the leak when you flush it (if there was one) that the stop leak plugged, and you may need to fix the hole correctly