[Nfb-science] chemical formulas

[Stocking]

Hello,
    Does anyone out there know the best program to use to show Lewis dot structures for college level organic chemistry.  I am dark blind, and have been trying to use word, but it is becoming more difficult in showing the bonding as the structures become more complex.  Is my only choice a scribe?
    Also, what have people use for Calculus?  I use Braille for all my books, but usually have to send in homework electronically.
Nathan