ClipPod lets you convert your Google Calendar into a free and easy to use project management tool!
Start by having everyone in your team share their calendar with the rest of the team. Google has a simple how-to guide to get this done.
Once you see everyone's calendar on the left hand side menu, choose a person to assign a new task and add it to their calendar.
Now since that task is visible to everyone in your team, everything you add to the task's pod is also shared across everyone.