Ok, time for some pics:
Ramshorn - don't eat live plants, grow up to approx 15mm in tropical, bigger in coldwater, come in red and brown colourways.
Physa sp. - don't eat live plants, grow to approx 7mm, shells go black if grown in a bucket outside.
The flat one - can't remember the name, possibly Planorbis or Helisoma sp. Don't eat plants, grow up to 5mm, breeds prolifically.
I have Malaysian Trumpet snails, but no pic of them, so someone else can post a pic.
Others are Apple snails and Blue Mystery snails, some kind person can post those as well, along with some info about them.