Email Studio for Gmail - Send personalized emails, schedule emails directly in Gmail
SendLater - Email scheduler for Mac Mail.
EmailDrips - Get inspired by examples of email sequences
EmailPlayground - EmailPlayground provides solution to schedule and send emails with ease.
Clearbit Salesforce - Rapportive for Salesforce, augment lead data
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.