GNU Dr. Geo, a libre software to design & manipulate interactive geometric sketches. Its aim is to be an open, easy to study, modify and extend interactive geometry software. Distributed with its source code it is modify-me-ready.
Teapot is micro web framework for Pharo Smalltalk, that focuses on simplicity and ease of use.
Pharo is a pure object-oriented programming language. It tightly integrates compiler, runtime and a modern IDE focused on being simple to use, provide immediate feedback and inline debugging. It implements a Smalltalk dialect with live objects, hot recompilation, full reflection, dynamic typing, direct inheritance, automated instance and memory management.
This is iStoa, a set of interactive activities to play with mathematics. Its target audience are primary school students. It contents is currently targeting grade 1.