Mockup3D contains some minimal but useful tools essential for creating a decent looking mockup of your screenshot.
Features
Mockup3D allows you to put an screenshot in a given 3D phone, and this phone can be rotated from left to right, It's position & size can be modified as well.

Background Editor
You can put a image background behind 3D phone, that can be starched to fit screen. To maintain image's aspect ratio you can fit from either only height or width. You can also use solid color in place of image.

Text Objects
Text objects can be added and text's formatting like bold & italic style, text alignment, text size and text color can be done easily.

Image Objects
Image objects can be added with base color and size & aspect ratio can be modified as well.

Both Image and Text Object's size & position can be manipulated.