(Note: There will be another soon about free project control software)
You will have heard of and, possibly used, MSProject. This is Microsoft’s project planning tool. It allows you to enter a series of activities, describe who can do them, how long they will take, and whether they need to come in a certain order (dependencies). In other words you can use it to create a project plan.
However, there are a number of free to use project planning tools available on the Internet. Here are a few of them.