Content Marketing Stack - A curated directory of content marketing resources
Weavr Cafe - Weavr is a platform to build active learning communities.
Intercom on Marketing - The marketing book for startups
Marketing for Devs - A book for programmers who want to learn marketing.
PPC Ad Editor - Create & Review PPC Ads Better. Faster. Together.
CXL Playbook Community - Playbook Community gives marketers access to thousands of step-by-step instructions supported.