This is one of the standard themes for PivotX. It also has all the common PivotX functionality built in. If you want to start developing themes yourself, this is a good one to tear apart and to learn from (after you have done the same with theme Skinny which is the start theme).
This is the "About" subweblog included in the initial PivotX software. You can change this text by editing the file '_sub_about.tpl' in the orange mint folder found in the templates folder. You can do this by directly editing the file, or you can go to 'Manage Media' » 'Templates' in the PivotX interface.