An ever-growing list of prototyping tools. I will continuously add more desciptions and tags/categories.
Create layouts on your phone or tablet using natural drawing gestures.
http://www.adobe.com/ca/products/comp.html
Design and prototype websites and mobile apps with Adobe XD CC (formerly Project Comet), the first all-in-one tool for UX designers.
Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps, and more.
A digital design tool built for cross-functional product teams. Alva lets you design interactive products based on the same components your engineers are using for production websites.
A suite of Sketch plugins meant for quickly scaling up marketing sites, but can be used for prototyping and proofs of concept.
Axure, one of the industry standards for wireframes and interactive prototypes, allows you to create comprehensive wireframes for applications and websites with interactive modules, dynamic content, and conditional logic without writing a single line of code. It also has strong documentation features.
Strenghts: Rich interactive wireframes, even for huge portals, widget libraries
Weaknesses: Slightly dusty interface, creating sophisticated interactions and logic is cumbersome, animations are not performant, no fluid layouts (only adaptive with fixed-width screens)
https://balsamiq.com/products/mockups/
Composite is a brand new way of creating interactive prototypes. It automatically connects to your Photoshop® documents and converts your mockups into interactive prototypes.
http://www.getcomposite.com/
This suite of plugins for Sketch called Craft by InVision also features a plugin that lets you quickly create clickable prototypes out of your static screens.
https://www.invisionapp.com/craft
https://itunes.apple.com/in/app/demonstrate-mobile-prototyping/id726285449?mt=8
…is a web animation tool for designers.
https://easee.design/
The popular interface design tool now also has a ‘prototyping mode’ that lets you link frames and objects to create basic clickable prototypes.
With Flinto Lite, you can connect your static screen designs visually into an interactive prototype.
Simplified design collaboration and prototyping. You can transform your static screens into interactive prototypes and also add gestures to create clickable interactions.
https://frontify.com/workspace
Instant Native Prototypes: Build and customize native prototypes directly on device. Form is an OS X app with a patch-based interface similar to Quartz Composer.
http://www.relativewave.com/form/
Fuse is a set of user experience development tools that unify design, prototyping and implementation of high quality mobile apps. The core Fuse platform is free and open source (MIT license).
Gravit Designer is a full featured free vector design app right at your fingertip. It is available for different platforms including Mac, Windows, Linux, Chrome and the Web.
FTW ;)
http://www.infragistics.com/products/indigo-studio
http://ionic.io/products/creator
https://www.irise.com/features/prototyping/
All-in-one Prototyping Tool for web and mobile apps. Drag-and-drop interface for building high-fidelity website wireframes and fully functional prototypes.
Animation and prototyping application for Mac & iOS. “Visually drag and drop layers to build complex interfaces on a WYSIWYG canvas. Add animations and tune them with the integrated timeline.”
One-stop solution for prototyping and usability testing: Run usability tests on interactive prototypes.
A diagramming software that can be used for flowcharts and interactive prototypes, too.
https://www.lucidchart.com/pages/tour/product-management-design
Turn Sketch designs into working prototypes, fast. Mirr.io is a lightweight tool to bring your designs to life — without leaving Sketch.
https://www.omnigroup.com/omnigraffle/
http://facebook.github.io/origami/
http://adamwhitcroft.com/proto/
Quant-UX provides an integrated usability tool to design, test and analyze interaction prototypes. Offers a visual editor with CSS3 styling and transitions to create fully functional prototypes. Recording of interaction during a test and real-time analysis.
Free online responsive design tool from Japan with interactive multi-device live preview.
Vectr is a free graphics editor used to create vector graphics easily and intuitively.
https://vectr.com/
Browser-based tool with a super simple interface.
https://wireframe.cc/