Wikids - An encyclopedia that talks to your kids

Typora - A minimal Markdown reading & writing app.

Litnerd - The Pixar for education, reading program for K-5 schools

Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.

COOLPHABETS - Helping kids around the world learn their native alphabets.

StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.