Senja.io - Senja is the easiest way to collect, manage and share testimonials, online reviews and feedback from your customers.
The Product Folks - A volunteer-led community of product managers and makers
Mailflow - Run your business from Gmail
Software Product Management Stack - Resources & tools to help you manage your software product
PM vs PM Challenge - That inner voice doubting you - “Am I a PM?
Product School - The global leader in product management training