I have owned or currently own all of the following:
Molluscs: pond snails (Physa sp.), brown ramshorn snails (Planorbis corneus), olive nerites (Neritina sp.), apple snails (Pomacea paludosa), indigenous fingernail clams, and stream-caught (non-native) golden clams, Corbicula fluminea
Crayfish: common blue (Procambarus alleni) and an assortment of feeders (Procambarus spp. and Orconectes spp.)
Crabs: red claw crabs Sesarma bidens (actually truly brackish), and fiddlers (Uca sp., also brackish)
Shrimp: feeder ghosts (Palaemonetes paludosus) and various Macrobrachium spp. (including M. lanchesteri, M. rosenbergii, and M. duarii)
I hope to possess some Southeast Asian mussels & limpets, large South American Atyids, and Congolese Macrobrachium dux in the near future.