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- Catholic Answers
- Catholic Community Television Network
- Catholic Culture (formerly Peter's Net)
- Catholic Encyclopedia (circa 1913)
- Catholic News Agency
- Catholic Liturgical Library
- Catholic World News
- The Coming Home Network International
- Code of Canon Law (1983)
- Couple to Couple League for Natural Family Planning
- dads.org from St Joseph's Covenant Keepers
- EWTN Global Catholic Network
- Human Life International
- Liturgy of Hours from DivineOffice.org
- Mass Times
- National Catholic Register
- National Conference of Catholic Bishops
- New Advent
- Saint Paul Center for Biblical Theology
- Vatican
- Catholic Radio and other Media
