Intercom on Product Management - The ultimate resource for aspiring product managers
SMMRY - Summarize articles, text, websites, essays and documents for free with SMMRY.
The Product Management guide - A book on how to create and ship products that people love
Free Summarizer - Summarize *any* text online in just a few secs. *MAGIC*
Software Product Management Stack - Resources & tools to help you manage your software product
Resoomer - Resoomer is a software and online tool for text summary: it allows you to summarize and analyze your articles by taking up the important concepts