Power BI Designer is a relatively new tool. It incorporates Power Pivot, Power View, Power Query, and Power Map. You can download it for free (at the time of writing), and it allows you to create and manage your Power BI dashboards, even when you don't have Excel installed on your machine.
First, you need to download and install Power BI Designer, and you can get it here:
When you launch it, you are presented with the following splash screen:
If you are new to Power BI Designer, I recommend having a look at the videos. They provide a good introduction to what you can do with the designer. ...