Quant UX is a research, usability & UI prototyping tool to test your design and analyze interactive prototypes quickly. Its visual analysis makes it easy to find and quickly fix pain points in your UI design.
Pencil Project is an open-source GUI prototyping software designed to help create mockups across desktop platforms. The built-in shapes collection lets users draw different user interfaces from desktop to mobile platforms.
Mockups-Design is a collection site of many mockups in various categories. The design comes in PSD format that you can use commercially with no attribution.
Penpot is a professional web-based design and prototyping tool for real-time collaboration between designers and developers. Penpot uses SVG as its native format instead of closed-sourced formats that need “exporting.”
Mediamodifier is a mockup generator and graphic design editor that lets you quickly turn your ideas into inspirational marketing visuals using an intuitive drag-and-drop editor and many pre-design templates.
Mockup World is a mockups stock site offering paper mockups, picture frame mockups, packaging mockups, poster mockups, billboard mockups, iPhone mockups, and more.
Figma is a cloud-based UI prototype and design platform that lets multiple teams collaborate on designing, testing, and releasing interface or product designs.
NinjaMock is a wireframing platform that enables users to create professional mockups and wireframes quickly yet efficiently.