Is this a message from God? :) I am just now resurrecting a nice interactive Algebra environment I sold as a desktop application back in the nineties. Google does not have "the beef" site (socialalgebra dot com) yet, but that's OK, I am still working on it. The promo site "stuck On Algebra" comes up on the google. (Yes the graphic design EMR team is on the way.)

The reason one does not see interactive software for advanced math is that it would have to, inter alia, (1) offer a WYSIWYG maths editor and (2) check intermediate steps entered by the student. Both a bit of work.

Gotta get back to work, those "work in progress" signs are fer real.