A free program for Android, by BlackBerry Limited.

The Blackberry Hub+ Inbox app allows you to stay organized on your smartphone. Inbox combines all of your contacts, email, and calendar events into one place. You can also share your thoughts and ideas with your friends on social media. 

The Blackberry Hub+ Inbox app is available on both Android and Apple devices. 

Inbox now supports calendar events from many IMAP email providers (i.e. Gmail, iCloud, Yahoo, and more).-Inbox now displays your most recent calendar events.-New notifications for Facebook, WeChat, Twitter, LinkedIn, WhatsApp, and more.-Improved layout and UX for a better user experience.-Improved performance and stability.