MockCity is a mockup generator that allows users to easily and quickly create mockups for their designs. It offers features such as a visual editor, a library of free mockup templates, support for multiple designs and products, and the ability to save and restore SmartObject parameters. Users can also troubleshoot and fix glitched or distorted mockups. The generator uses the web-based editor Photopea and supports PSD files. Users can support MockCity by using their affiliate link when purchasing premium mockups or by sharing the generator with others.