Below you will find some free applications that may be useful for your child at home. Feel free to have a look at them. 

Educational Games

TuxMath - Fun math games for various age groups to help them improve their math skills

TuxPaint - A free painting or art tool for kids

TuxTyping - typing games for kids to learn to use a keyboard more efficiently

Productivity

Open Office - Free productivity suite similar to Microsoft Office

Other Utilities

Audacity - Audio Editing Software

Blender - 3d modeling software

GIMP - Graphic editing software similar to Photoshop

Google SketchUp - A drawing/architecture program