Speaking.io - Brutally honest public speaking advice
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Konflist - Curated list of tech conferences all around the world!
Upcoming.org - A simple way to share and discover interesting events
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Colloq.io - Discover a new way to the conferences you like.