SaaS 1000 - Free exportable list of the fastest growing SaaS companies
Bullet Train - The Ruby on Rails SaaS-in-a-Box.
hotglue - An embeddable data integration tool for B2B developers built on the Python ecosystem.
Look at that SaaS - Inspiration and resources for SaaS founders
Ultimate SaaS Guide - 100 Q&A asked around scaling, sales and raising capital.
pickSaaS - Hundreds of SaaS products, analyzed.