Invision - Prototyping and collaboration for design teams
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
GIMP - GIMP is a multiplatform photo manipulation tool.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.