Olyo - Direct marketing via Facebook Messenger
Mattermark Daily - A curated newsletter of blog posts from investors & founders
Messenger Platform - Discovery, chat extensions, and richer experiences
Folloh - It brings all the news you want from around the web
Upcado - Super easy to use Messenger Marketing tool for your business
LetterHunt - LetterHunt connects you to 10,000+ niche, active newsletter writers to promote your product.