HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Pramp for Product Managers - Practice product management mock interviews with other PMs
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.
The PM Interview - Practice PM Interview Questions (w/ timer).
iMocha - Make intelligent talent decisions.
Speechapp - The simplest way to practice for your next job interview