Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
RemoteHQ - Real-time collaboration for distributed teams
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Terrastruct - A diagramming tool for software architecture
Platforma - Wireframe library of layouts and UI elements
Diagrams for Mac - A diagram editor for visualizing structures and processes