Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Freesound - The Freesound Project is a collaborative database of Creative Commons licensed sounds.
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Sample Focus - The easiest way to find the perfect audio sample
Userflows - Automatically generate user journeys
Moody sampler - A cloud connected audio sampler, including 1000+ instruments