Zero
Discussions
Jelly: The Easiest Way to Share an Inbox
Shortwave — AI-native email for business
Integral
Campsite — Work communication for distributed teams
Campfire
UnInbox - Modern email for teams and professionals. 100% Open Source.
Noor - Chat for teams
Zulip — organized team chat
Matrix.org
Inbox Zero
StartMail - Private email you can trust
Lark | Business Chat & Collaboration Tool
Polymail
Secure email: Tutanota free encrypted email.
Proton — Privacy by default
Mailo, la messagerie qui vous respecte
Station • One app to rule them all
Convy — reinventing messenger for remote teams
Babble - Forums for a New Generation
Mimestream
Ready
BlueMail - The Best Email App for Windows, Mac, Linux, Android and iOS
Secret Messenger - A new era of messaging
Beeper — All your chats in one app. Yes, really.
Franz – a free messaging app for Slack, Facebook Messenger, WhatsApp, Telegram and more
All-in-One Messenger
Texts
NuovoTeam Push-to-Talk (PTT) & Productivity Suite for Non-Desk Workforce
The Power Email App - Postbox