Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Birdly - Birdly is an expense management and expense report solution for SMBs.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Siftery Track - Effortlessly visualize & optimize your team's software spend
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.
Expensify - Import expenses directly from a credit card to create free expense reports quickly. Approve reports online and reimburse directly to a checking account with one click.