Webmention.io - Webmention.io is a hosted service created to easily receive webmentions on any web page.
GoZen.io - GoZen Growth is a user-friendly email marketing software with outcome-driven and industry-specific email templates. Get started and grow your business now.
Blog2Social - Auto post, cross post, re publish, re post and schedule your WordPress blogs posts to social networks like Facebook, Twitter, LinkedIn, Instagram, Pinterest
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.
Bridgy - Bridgy pulls comments, likes, and reshares on social networks back to your web site. You can also use it to post to social networks - or comment, like, reshare, or even RSVP - from your own web site. https://brid.gy/
MailChimp - MailChimp is the best way to design, send, and share email newsletters.