Scratch - block coding/programming - create animated and interactive stories and games. Children (with parental permission) may create an account to save and share their animations/creations with others, or be able to edit their creations at school or at home.
Open Office - Free Office suite of Word Processor, Presentation, Publisher, Spreadsheet, Database (similar to Microsoft Office, but FREE!)
Tux Paint - "free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6)."
Tinkercad - 3-D creation - easy-to-use online program that allows students to imagine and design their own 3-D objects that could be printed on a 3-D printer. Children (with parental permission) may create an account to save and share their 3-D objects with others, or be able to edit their creations at school or at home.
SketchUp - CAD (Computer Aided Drafting) to create three dimensional (3-D) drawings
Sculptris - Virtual "lump of clay" to mold