WorkSuite - Worksuite is a smart, user-friendly Freelancer Management Platform
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
TalentDesk - Simple Recruiting Software & Applicant Tracking System
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
TalonFMS - TalonFMS is a powerful, easy-to-use platform that brings your freelancer organization together and streamlines the way you communicate and manage your freelancers.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.