The Google Cemetery - A list of dead Google products and why they died
The PM Interview - Practice PM Interview Questions (w/ timer).
Startup Graveyard - History shouldn't have to repeat itself
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.
Myskillwall - The best tool to prepare your job interview