Roundcube - Web-based IMAP email client
Checker Plus for Gmail - Displays new emails and the sender's contact photo, get notifications or even listen, read or...
Shift - Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps
POP Peeper - POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new...
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
PopTrayU - Have you fallen in love with the fabulous email notifier program Poptray, but you're running a...