textadventures.co.uk - Create, play and share text adventure games.
MathIsFun Times Table - Learn Your Multiplication Tables
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
GCompris - Educational Game for Children 2 to 10 years old.
Windows Frotz - Windows Frotz is an interpreter that can play all the old Infocom text adventures.
I Know It - "I Know It" is an online game for practicing primary-level math concepts.