Notism!

InVision's prototype tool lets you create interactive wireframes and high-fidelity prototypes. Share your work and get instant feedback right on-screen.

Free web and mobile mockup tool.Transform your design and mockups into clickable interactive applications. Perfect way to validate ideas faster with lean startup thinking.

Build your idea into a product.Design and programming skills are no longer necessary to create a product. With STUDIO, you can make your idea into a real product regardless of your skill and knowledge.

Pixelapse is visual version control and collaboration platform for designers. It powers the document backup, version control and collaboration needs of thousands of creative teams, agencies and freelance designers.

Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast. It remembers you — there's no logging in, no project management, no bullshit.

SavahApp is a collaborative platform that streamlines feedback right to your design screen that allows designers to create high-fidelity prototypes for web and mobile apps without writing a single line of code. With Savah, designers, design agencies and businesses can transform their designs into attractive interactive prototypes and mock-ups for web and mobile apps. Users can share these prototypes with a single click to their team / clients to get their visual feedback right on the design screen. No more emailing back and forth your design files you can effortlessly invite your design team/clients to your projects where they can review and contribute. »

Specfox is the first tool to address the tedious process of writing website specifications, which is often frustrating and time-consuming. You shouldn't be spending hours trying to explain developers design features and creating ugly descriptions in software which was not built for that purpose. Specfox helps you create, edit & manage design specifications easily and pain-free.

Use your existing WordPress site to get feedback on your design projects. Upload your design images, wireframes, mockups, logo sketches, photography and more. Gather comments directly on top of your designs. Get clear approval and move forward with the project.

The most productive way to share designs, gather useful feedback and get approval

Upload your designs,mockups or wireframes by file or by URL snapshot, organize them and connect them to web prototypes. Share them with friends, colleagues and clients to get point specific Feedback. Giving Design Feedback is also possible without any registration.

Symu is an easy to use tool for web designers and videographers. Everyone can add comments anywhere on a graphic or video project. Symu gives you the ability to transform static designs into fully interactive prototypes.

The overall tool for creative & design collaboration:- upload, manage & share assets- gather feedback, discuss & approve designs- create & share design prototypes- specify & handover design & web projects - 1 FREE project; plans start from $19

Markly is a measure and design spec plugin/extension for Photoshop & Sketch. It is made for modern web designers & app front-end developers. You can add specification marks by simple clicking and dragging. Coordinate, dimensions, distance or fonts, no matter what and where you want. http://marklyapp.com