Our team uses Thoughtworks Mingle (https://www.thoughtworks.com/mingle/ https://www.thoughtworks.com/mingle/) Its got a simple, rich interface and is free for a

Our team uses Thoughtworks Mingle (https://www.thoughtworks.com/mingle/ https://www.thoughtworks.com/mingle/) Its got a simple, rich interface and is free for a 5 user team. You can create your own card walls and track features/bugs/to-do items with different types of cards. Works really well for Agile teams.