Roundcube - Web-based IMAP email client
Houseparty - Brining empathy to online communication.
HEY - Email at its best, new from Basecamp.
Booyah - Video chat with up to 12 friends at the same time.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Slack - A messaging app for teams who see through the Earth!