Xobin - Most Comprehesive Pre-Employment skills testing and Psychometric Assessment Platform.
Speechapp - The simplest way to practice for your next job interview
After Interview - Get feedback from job interviews to improve
Pramp for Product Managers - Practice product management mock interviews with other PMs
Interviews on Skype - Test candidates using a real-time code editor over Skype
Product Management Exercises - A repository of product manager job interview exercises