Slack with your Users - Speak to your app's users entirely within Slack
Product School - The global leader in product management training
Conversity - Easiest way to manage Facebook Messenger chats
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Avochato - Text messaging for your business.
Intercom on Product Management - The ultimate resource for aspiring product managers