Ferns: Rabbits Foot, ET, Lemon Button, Deers Foot, Java (several types), Selaginellas
Moss: Java moss or Riccia are good for starters, Joshs has some nice mosses as well
Others: Philodendrons, Pileas, Peperomias, Callisia, Neoregelia Bromeliads, Cryptanthus, Pellionias, Dischidias, etc
If you look on several sponsor sites, they offer plant packs for certain size tanks that is a great way to get started.