We are using bizzanta as our main tool that allows us track all tasks we do with clients or internal projects so it's very easy! The interface could be more user friendly but I think they're working hard towards making this change eventually when there will need some technical knowledges from users perspective because now you can't really customize everything (some features like colors aren´t customizable).
It has been great since its launch by allowing me create my own templates easily without having any knowledge about programming languages nor HTML code which would make things complicated if i had them before launching into production mode :D.