At the far left, just to the right of the mortar rounds and the lone RPG is a long, pointy looking South African or Iraqi 155mm projectile (Iraqis copied or licensed the design). This is the round designed by Gerald Bull, who picked his friends poorly and ended up getting whacked by the Israelis. These ended up in a LOT of IEDs where I was.
Just above the buttstock on that RPK looking thing is a stack of drums for the AGS17, the russian belt fed grenade launcher similar to our MK19.
Just above that are some vintage british 2 inch mortar rounds. I've actually fired some of those.