Excellent design sharing and feedbacking tool

InVision is my favorite tool for building software prototypes, designs, and sharing them within and across organizations. I can easily and quickly access all my projects, those created by myself as well as those shared by my peers. There is no need for registration, although you might limit access to your projects to invited, registered users only. It is very handy when you are working under NDA agreements. The app is also mobile friendly and will work on most mobile phones and tablets. There are some small cons as well. I would hope to find dynamic transitions between screens (like Balsamiq mockups can do), but this is a graphics/design tool, so you can't really have everything. I would still highly recommend using InVision if you are a designer, UI/UX specialist or project manager/product owner!