Hi Helen, if you would like to find those homes that are Open on Weekends you can try the public version of MLS Listings here: http://mlslistings.com/
Just check the "Only show open houses" box before searching.
I would suggest that you do find a licensed Realtor to work with you in your search. . Since the Seller pays the commission to the Buyer's Agent there really is no reason not to get professional guidance when purchasing a home, after all, the Seller has full professional representation â€“ you should too!