SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Design Principles - An open source repository of design principles and methods
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Atlassian Design - Design, develop, and deliver
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Facebook Design Resources - A collection of free resources made by designers at Facebook