Most echinodorus species (amazon sword, bleheri, ozelot, etc)
any anubias variety, and there are a few
java fern (any variety I've seen)
wisteria
mosses--java, Christmas, flame
ludwigia species--green, water primrose, red (may or may not keep the red coloration. Mine appears to stay green until it gets to a certain distance from the lights then it turns red)
anacharis/elodea
hornwort (floating)
dwarf water lettuce (floating)
crypts--lots of different crypt species, wendtii green, red, and bronze being the more common I see
other vallisneria species (jungle val, V. spiralis)
aponogeton species
some hygrophila species--compacta, difformis (which is wisteria, btw)
Marino moss balls
All my tanks are low tech, low to medium light and these have all been relatively successful for me. I use play sand for substrate, in case you're wondering, dose water column ferts sporadically, and shove a few root tabs near the heavy root feeders on occasion.