While doing mockups and wireframes, we always had an affinity for open-source tools. Pencil was our first choice for a long time. But when started with mobile apps we found some limitations in Pencil and started searching for a better alternative. We tried many freemium tools such InVision App, Figma, etc…
Finally, we found a comparatively better tool that helps you to create mockups very easily.
Quant-UX is a web-based mockup/wireframe builder. You can visit this tool in the link https://www.quant-ux.com/