Your ultimate guide to interview preparation is an amazing guide that covers pretty much everything you need to know to prepare & pass a technical interview.
Pramp - 1 hr online interviews where you interview someone and they interview you back.
LeetCode - Collection of 700+ interview coding challenges.
Coding Interview University - Complete computer science study plan to become a software engineer.
The Coding Interview by Palantir - Great tips.
Interview Map - A map that can help you make a better preparation for the next interview.