Free Stock Photos

  • https://css-tricks.com/sites-with-high-quality-photos-you-can-use-for-free/

Free Marketing Automation Software

  • https://www.mautic.org/

Website Analytics

  • https://www.google.com/analytics/web

A/B Testing Software

  • Freemium Service: http://optimize.ly/

Email Marketing

  • Freemium Service: http://mailchimp.com/

Via TechnoRealism, LLC (Gary Palmer Jr.) & the Open Source Marketing Project (Ben Hunt) / CC BY-SA 4.0