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/

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