Any of the Anubius species, but my personal favorite is ANUBIAS FRAZERI, Tall Anubias Specie. For a picture, go to:
I have one in my 38 gal. community tank & it is AWESOME!!! It's so awesome, as a matter of fact, I just ordered another one this morning from Heather! :)
I like the looks of Hornwort, but it sheds something awful for me (shrug). Instead, I like Guppy Grass (Najas guadalupensis). Some say it is a weed that will overtake a tank, but I have some in my guppy tank & in my betta tanks & everybody seems to really enjoy swimming through it (I leave it floating for the most part).
And, of course, java fern and java moss - LOVE the stuff! Cheap & easy - what's not to love??? :)
One thing to remember with these plants, though - DO NOT plant in the substrate (they will rot). Attach to driftwood or rocks - makes it easier to move them around, too! :) :) :)
I'm not a high-tech plant person and these are plants that, so far, are working out for me in my low-tech, low-light tanks.