The Unbound Bible
StudyLight (left column, halfway down)
Bible.com (dozens of translations)
Bible Study Tools at Crosswalk.com
DiscipleLand Bible Curriculum for ages 2-12
Explorer's Bible Study - While these studies are available for purchase, you can also follow along with them week by week for free. You can print them in PDF format for all age groups.
Thy Word Creations (Effortless Bible Memorization)
The Scripture Memory Connection (wonderful and free Bible memorization software)