A Guide to Marketplaces - Everything you need to know about building a marketplace
The Product Folks - A volunteer-led community of product managers and makers
Terminalyst.com - Terminalyst.com is the first of its kind job board for geeks, enabling them to search for their dream remote, visa-sponsored or 4-day week jobs all in one place, through their favourite user interface.
Product School - The global leader in product management training
Cohort - Find the people you need through the people you already know
Intercom on Product Management - The ultimate resource for aspiring product managers