Product School - The global leader in product management training
On Deck - Business Loans | Small Business Funding | OnDeck
Software Product Management Stack - Resources & tools to help you manage your software product
PM News - The best product career advice —from world-class PMs.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.