Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Platforma - Wireframe library of layouts and UI elements
lstore.graphic - Mockup Scene Creator
Craftwork - A collection of User Interface resources made by Craftwork
Flatlogic - Business Software: AI-Driven Solutions at Speed.