- The Apostolate's Family Catechesis download free & discussion guide play it as a game free online
- Mercy Academy has a multi-level plan for Christian Doctrine
- Family Faith Formation seems like a nice program - for $120 they send you a once a month packet for your family which includes games, activities, booklets, and audio CDs and lessons that take about an hour per week to cover.
- Father McBride's Family Catechism (EWTN catalog has it new) take a look at the inside, it wouldn't be for youngers.
Sacraments / Doctrine - Mass unit study - Sunday Preparation looks AWESOME! and it's free!, St. Patrick's Summer by Marigold Hunt, discuss Q in St. Joseph's Baltimore Catechism, Catholic Catechism Board Game, Faith Folders for Catholics
Living the Liturgical Year - we've all discussed this at length with my favorite suggestions being at 4Real Learning forums
Scripture - Coloring pages & narrations from Golden Children's Bible, Life of Christ, Bible History from TAN books : Knecht's Bible History (the slim blue volume) for ~K-3, Schuster's Bible History for 3-6, and the Bible History by Johnson, Hannan, and Sr. Dominica for 7-9 (the first two books have the same illustrations). Middle & High school students just read the Bible.
Saints - Vision books are our favorites for upper elem / middle school and Catholic Mosaic suggestions for youngers.
Apologetics - for the older crowd.