What are the best apps for integrating tasks and calendar events in one interface for both Mac and iOS?

Hey thanks for the link, I have checked it out, I had a bit of free time yesterday it's being Saturday so added it to few questions which were very relevant to the product and it's a product with a free so hopefully it was helpful to the author of those questions plus it's a relatively unknown product so they might find it interesting to discover something totally new.but I will surely keep it in check from now on as written in the promotion policy.. thanks :)