How to do we create the best ToDo feature for software developers?

We've created OSIOS.net - a new platform for mobile app developers that guarantees more profit per project.

And we need to create a best-of-breed Task/ToDo/Milestone section-

What tools do you use, and why? Any ideas?

Start:Jun 26, 2016

End:Jul 25, 2016

We charge $100 startup fee to join OSIOS, we'll waive that for any ideas given to us

We'll give you a copy of our Design Grids for Free

We'll give you free Icon artwork for Free