Some easy low-light plants include most cryptocoryne species, java fern, java moss, and the various types of anubias. There are others of course, but that's all I can think of at the moment.
all the above are good.
i grow water wisteria in my 1.5wpg tank and it flys away..(dosnt get as bushy as it would under high lighting co2 etc) but its a great space filler.