It also has quite a variety of historic newspapers. Admittedly it is a hodge podge of old newspapers but it indeed is something that you can search for free.
Recently, they have started a pilot project to add more historic newspapers, but that does not include all of the newspapers available for research on the site.
Here are two links that you should try:
In both cases, check out the list of topics on the right to narrow down the collections and titles you wish to search.
There is definitely enough content here that you should include it in your repertoire of old newspapers to search for articles about your ancestors.