Invision - Prototyping and collaboration for design teams
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Pastel - Sticky note-based feedback collection tool for live websites
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.