Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Checkmarx - The industry’s most comprehensive AppSec platform, Checkmarx One is fast, accurate, and accelerates your business.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab