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Communication software
Chat, email, messaging and team collaboration apps. Merjerz lists 3 apps here (2 free): Signal, Slack and Thunderbird.
Communication
Signal
Private messenger with end-to-end encrypted messages, voice and video calls, run by a nonprofit.
CommunicationSlack
Team messaging app organized into channels, with calls, file sharing and integrations. Free plan with limits, paid …
CommunicationThunderbird
Email client with a calendar, address book, chat and support for multiple accounts, filters and add-ons.