Tribe of Mentors - Short life advice from the best in the world, by Tim Ferriss
Plato - Share knowledge with your team through simple Q&A
Mentorcam - Mentorcam is a marketplace where people can access well-known public figures for 1:1 advice and mentorship.
Relay - An extension that adds Discord-style chat to every website
MentSpot - Find a mentor or become one for free
Snapstorms - An archive of advice from Mark Suster on Snapchat