That is not even that much. ccel.org has a lot of Catholic writings, not all of them are Catholic though. Here is another site with a large number of Catholic writings. Not all the links work though.
Here are some writings by Anselm, Nocholas of Cusa, and Hugh of Balma.
Here is another site that has many books.
If you ever want to read papal encyclicals here is a site with many of them.
Here is a site that does not have books online but it has a list of Catholic authors who commented on scripture.