J'ai déjà parlé ici de Philosophie et Wiki. En voici une version mathématique :

This is an adaptation of Jeremy Ruston's TiddlyWiki (version 2.0.2) that is suitable for writing scientific notes (e.g. research notes, lecture notes, projects, homework, ...). TiddlyWiki is an amazing JavaScript program that lets you read, edit, save and share infomation conveniently in a single html file using a familiar browser even without an internet connection. ASciencePad extends this by integrating a what-you-see-is-what-you-get editor where one can easily type mathematical formulas (displayed with MathML) and produce 2D cartesian, parametric and polar graphs (displayed with SVG).

Ascienpad