Interviews on Skype - Test candidates using a real-time code editor over Skype
Product School - The global leader in product management training
coderpad - Collaborative code editor with in-browser, real-time execution. Conduct programming phone screens like a boss.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Adaface PairPro - Conduct Pair-Programming Interviews Remotely
Intercom on Product Management - The ultimate resource for aspiring product managers