Adobe Creative Cloud is a software as a service offering from Adobe Systems that gives users access to a collection of software developed by Adobe for graphic design, video editing, web development, photography, and cloud services.
Adobe Experience Design is User Experience design software developed and published by Adobe Systems.
InVision provides design, review, and user test products without a single line of code. Tools for prototyping, task management, and version control are included.
An open-source GUI prototyping tool that's available for ALL platforms. Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms.
UXPin is a collaborative design platform used by designers. The software supports full featured design from wireframing to prototyping and hi-fidelity mockups.