Invision - Prototyping and collaboration for design teams
MailDeveloper - Advanced editor for responsive HTML emails
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
EDM Designer - Make Responsive Email Templates. No Code.