Birdly - Birdly is an expense management and expense report solution for SMBs.
Software Product Management Stack - Resources & tools to help you manage your software product
PushMarket - Automate personalized emails for ecommerce (YC15)
The Product Management guide - A book on how to create and ship products that people love
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
Product Management Exercises - A repository of product manager job interview exercises