Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.Discontinued
The last release/commit was in October 2019.
Pencil Project vs Balsamiq Wireframes opinions
It's ok as an alternative, but it fails in creating interactive wireframes
It's a simple cross-platform tool, but with minimal necessary set of features:
- really cross-platform
- good collections of shapes, which seems are extendable
- export to various formats
No possibility to export to html.
All needed in, easy to use, stabel.
Quite good and lots options, and still free
Figma is a vector graphics editor and prototyping tool which is primarily web-based, with additional offline features enabled by desktop applications for macOS and Windows. The Figma Mirror companion apps for Android and iOS allow viewing Figma prototypes in real-time on mobile...
Figma vs Balsamiq Wireframes opinions
Penpot is the first Open Source design and prototyping platform meant for cross-domain teams. Non dependent on operating systems, Penpot is web based and works with open web standards (SVG). For all and empowered by the community.
Wireflow is free, online, real-time collaborative, open source tool for creating beautiful user flow prototypes.
Framer combines the power of code with the ease of visual editing. Prototype beautiful microinteractions or realistic apps. It’s time to design with development in mind.
Moqups is an all-in-one online design platform that's smart, simple and fast. Go from diagrams to wireframes and prototypes without switching apps or updating across platforms.
A desktop Penpot app for Windows, macOS and Linux.
Origami Studio is a free design tool built by Facebook designers for creating interactive UI prototypes. An elegant, layer-based interface allows designers to repaidly create prototypes with layers, build interactions and then share them with others.This app doesn't have any features at the moment.
Online tool for creating mockups in the browser. Use your browser’s save function to save the file (just html for view only, complete save for an editable version) or export to codepen for others to view.