The Holy See The official Vatican website, including numerous papal documents and a new search engine.
Catechism of the Catholic Church Full text of the 1997 American edition, plus search engine.
Code of Canon Law (The Laws of the Roman Catholic Church) The full text of the 1983 edition via IntraText.
The Catholic Encyclopedia An online transcription of the original print edition, which was published between 1907 and 1912. As the 1908 preface says, "The Catholic Encyclopedia, as its name implies, proposes to give its readers full and authoritative information on the entire cycle of Catholic interests, action and doctrine."
New Advent Includes articles from Catholic encyclopedia, full text in English translation of Aquinas' Summa Theologica, English translations of selected documents of the early church and of the Catholic Church; and numerous Catholic links.
ZENIT The homepage of the Rome-based international news agency. The agency's mission is to provide objective and professional coverage of events, documents and issues emanating from or concerning the Catholic Church for a worldwide audience, especially the media.
Catholic.net The successor to the Catholic Information Center on the Internet (CICI), this site provides access to leading Catholic magazines and newspapers, papal and Church documents, and devotional services, as well as weekly highlights from Catholic publications and web sites.
United States Conference of Catholic Bishops The United States Conference of Catholic Bishops (USCCB) is an assembly of the hierarchy of the United States and the U.S. Virgin Islands who jointly exercise certain pastoral functions on behalf of the Christian faithful of the United States. The purpose of the Conference is to promote the greater good which the Church offers humankind, especially through forms and programs of the apostolate fittingly adapted to the circumstances of time and place. This purpose is drawn from the universal law of the Church and applies to the episcopal conferences which are established all over the world for the same purpose
Roman Theological Forum "The Roman Theological Forum is an association of scholars working with other interested persons for the advancement of theology and philosophy within the tradition of the Roman Catholic Church. It addresses contemporary questions of theology and philosophy, beginning from a Thomist point of view, and it is promoting with special attention a neo-Patristic approach to the interpretation of Sacred Scripture.
St. Isidore of Seville (c560-636 CE) is the Patron Saint of the Internet.