Speaking.io - Brutally honest public speaking advice
DocDroid - DocDroid is a service for sharing document and slides.
Konflist - Curated list of tech conferences all around the world!
SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.
Event Hunt - Startups and Tech Events Curated By Locals
DocSlide - DocSlide is an online document and knowledge sharing platform.