The Product Management guide - A book on how to create and ship products that people love
MartechGuru - Keep track of your marketing technology SaaS contracts easily. No more spreadsheets.
Product Management Exercises - A repository of product manager job interview exercises
Martechbase - A searchable database of 7,000+ marketing tools
Product School - The global leader in product management training
CabinetM - Pinterest for marketing tools: find, compare and build stack