Producteev, it's been real. 3 years now.
Fueled purely by a desire to export my tasks from Producteev, I've been forced to build my own API consumer in lieu of a proper Export feature. Naturally the code is yours free if you want it:
This project writes a CSV file and displays results in Bootstrap fluid 12-column grid.
Thanks for the good times Producteev, and best of luck in all your ventures.