Pramp for Product Managers - Practice product management mock interviews with other PMs
Failory - Failory is a community visited by startup founders every day to read articles about entrepreneurship, interviews with failed and successful founders, insightful postmortems and our monthly reports.
The PM Interview - Practice PM Interview Questions (w/ timer).
Reject Them Softly - Rejection letter inspirations from companies
Speechapp - The simplest way to practice for your next job interview
Startup Graveyard - History shouldn't have to repeat itself