Hydrocoytle is fairly boad leafed, but it's much more like a lily than a sword, as in it has a soft stem that won't support a fish.
Many crypts are fairly broad leafed. C. Ponterdifolia comes to mind. 
Anubias barteria and gracillis. Java Fern is decently broad leafed, not quite a sword, but not tiny either. 
All are low light.