Can't see the red spot on the venter here, but I've seen it previously when the spider spun her web.
Most likely a juvenile N. triangula.
Probably an emaciated Steatoda male.
Ctenidae razor spider
When I moved a rock embedded in the sandy floor, this spider ran out. It was probably next to, or on the rock, not under it. This was at the very bottom of the cave.
8mm long head/body. These spiders usually hang under a messy web close to the cave floor. At least part of the web is usually on a rotting log.