instashare - Share your photos to instagram from your mac
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Plover - Browser Airdrop - transfer files to anyone, any device
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Starfiles - File hosting done simple
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.