Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Precursor - Precursor helps designers and developers communicate and collaborate in real time.
Userflows - Automatically generate user journeys
mi.team - Collaboration app with chat, task board & video conference
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Justinmind - Define awesome experiences through wireframes & prototypes.