How to Add GDPR Consent in Email Optin Forms and Popups - OptinMonster
GDPR - JetPopup
Tracking-industry body IAB Europe told that it has infringed the GDPR, and its “consent” pop-ups used by Google and other tech firms are unlawful. - Irish Council for Civil Liberties
Publii CMS - free GDPR Compliant Cookie Consent
MailChimp and GDPR: How to Set up a Subscriber Opt-in Form — Nicky Pasquier
Are Your Popups GDPR Compliant? | GDPR Ready Popups - OptiMonk Blog