TidyCal

For the price, this is an incredible deal for what you get when compared to other competitors.

They just announced the "round robin" feature added to the tier 2 package today, and I'm very excited to try it out. This is the one feature that has stopped me from being able to use this tool for the project I've wanted to.

I find the app highly configurable, has great features, and exceeds my needs now that Round Robin assignment is here. GREAT VALUE - give it a try!