Visily - The easiest and most powerful wireframe software for agile teams.
Audio Hero - Over 250,000 royalty free music & sound effects for videos
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
Zeplin - Collaboration app for UI designers & frontend developers
Premiumbeat - Premiumbeat.com provides high quality Royalty Free Music.