Mattermark Daily - A curated newsletter of blog posts from investors & founders
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Folloh - It brings all the news you want from around the web
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
LetterHunt - LetterHunt connects you to 10,000+ niche, active newsletter writers to promote your product.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.