Calca is absolutely incredible and an invaluable part of my workflow. I only wish that praeclarum would open source it (with a prominent option to donate) so th

Calca is absolutely incredible and an invaluable part of my workflow. I only wish that praeclarum would open source it (with a prominent option to donate) so that it can live on forever, since it seems a little undermaintained at the moment. As far as I know, there's nothing exactly like it out there (with respect to typing calculations in plain text, then immediately seeing results inline).