The Custom Content Types module adds custom post types (CPTs) to your site. These CPTs allow you to add content that doesn’t necessarily fit into a post, but isn’t right for a static page either. Since this is part of Jetpack, you need to install Jetpack plugin.
The Portfolio custom post type gives you an easy way to manage and showcase projects on your site.
The Testimonial custom post type allows you to add, organize, and display your testimonials.