Official Vatican homepage
The Vatican website needs no introduction
Prácticamente todo lo que necesites saber sobre tu Iglesia Católica lo puedes encontrar aquí.
Dr. Scott Hahn - The Official Site
Dr. Hahn's website, known convert to Catholicism from Protestantism.
Patrick Madrid is the president of the Envoy Institute which, from 1996-2011, published the quarterly Catholic journal, Envoy Magazine, and currently conducts the Catholic Apologetics Academy and Catholic Apologetics Summer Camp.
Dave Armstrong Blog
Dave Armstrong is a Catholic author and apologist, who has been actively proclaiming and defending Christianity since 1981, and Catholicism in particular since 1991 (full-time since December 2001).