Steak – Track if someone opened your emails. Especially useful if you’re doing sales or outreach. Also adds a CRM to Gmail.
Really Good Emails – Superb for designed email inspiration. Welcome emails, sales emails, the whole works.
Gmass – Send mass emails in Gmail (up to 2000 emails/day). Gmail = way better deliverability than using an email marketing platform. Link it to a spreadsheet to personalize names and phrases for every contact.
Art of Emails – Tons of actually unique email templates for cold emails, outreach to influencers, sales follow ups, etc.