I also love Intercom. I took their Jobs to Be Done methodology and made a value prop project out of it! https://www.intercom.com/books/jobs-to-be-done
I also think stripe has a great website for their products and reference it frequently: https://stripe.com/
Segment has pleasantly come a long way - they have a clear explanation of who their product is for, use cases, etc: https://segment.com/