Product Resources List - The biggest list of free product management resources
FilePursuit - FilePursuit is probably the most sophisticated platform that is offering a best in the class search engine for file links.
Product Wednesday - Every Wednesday, receive a handpicked selection of tools made for Product Managers, Product Designers, UX Researchers and every member of the Product team.
AIO Search - AIO Search is a multi-purpose file-searching provider that allows its users to enjoy the searches of the search engines, file hosting service providers, search engines, and streaming websites from a centralized platform.
Intercom on Product Management - The ultimate resource for aspiring product managers
MegaDownload - MegaDownload is an easy to way platform to search and download files from the leading hosting sites on the internet.