Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Front - multi-channel inbox service for collaborative teams
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.