http://www.cnvs.org/

This site serves as a clearinghouse for persons interested in volunteer service.  CNVS publishes the RESPONSE directory listing full-time service programs offered by Catholic and Protestant organizations.  Visit this site to request a copy of the directory, or to search their on-line database of volunteer opportunities.

http://www.idealist.org/

Idealist allows organizations - whether they have a Website or not - to enter and update information about their services, volunteer opportunities, job openings, internships, upcoming events, and any material or publication they have produced. 16,000 organizations in 130 countries are already using Idealist.

http://call-to-action.org/

Call To Action USA (CTA) is an independent national organization of over 18,000 people and 40 local organizations who believe the Spirit of God is at work in the whole church, not just in its appointed leaders. We believe the entire Catholic church has the obligation of responding to the needs of the world and taking initiative in programs of peace and justice.

http://www.catholic.org/index2.html

The mission of Catholic Online is to serve as a center for the exchange of  information for Catholics and all people of God, to help them deepen their understanding of the Catholic faith. 

http://www.acad.cua.edu/pallotti/

The Pallotti Center  links you to full-time volunteer opportunites  in the United States and overseas. Through their Connections directory, you can read about more than 100 volunteer, faith-based programs (90% of which are Catholic).