Communication

Pairs phones and computers on the same network to share files and the clipboard, mirror notifications and use the phone as a remote.

Single inbox that bridges WhatsApp, Telegram, Signal, Slack and other networks into one desktop chat list.

Thunderbird fork that ships extra fixes and features which have not been merged into the upstream release.

Lightweight GTK email client that stores mail as plain files and adds features through a large plugin set.

Chat app that sends messages over ordinary email accounts, encrypting them end to end where both sides support it.

Voice, video and text chat organised into servers and channels, with persistent rooms that stay open between sessions.

Matrix client for chat and calls, able to connect to any homeserver including one you run yourself.

Email, calendar and contacts client whose free licence covers personal use on one device with two accounts.

Container app that holds many web messengers in one window, each service kept in its own tab and session.

IRC client written in Rust with a modern interface, configured through a single TOML file.

Terminal IRC client with a split-window layout and a Perl scripting interface for automating channel tasks.

Peer-to-peer calling and messaging app that connects clients directly, with no central account server in between.

Desktop app for Jitsi Meet video calls, working with the public service or any self-hosted Jitsi server.

KDE IRC client with per-channel settings, nickname watch lists and automatic reconnection to saved networks.

Messenger widely used in Japan and Southeast Asia, with a desktop client for chats, calls and sticker shops.

Open-source SIP softphone for voice, video and instant messaging with any standards-based VoIP provider.

Email client with a native C++ sync engine and one unified inbox across IMAP, Gmail and Office 365 accounts.

Desktop client for Mattermost servers, letting a team run its own channel-based chat on its own infrastructure.

Chat and meeting app from Microsoft, with a free tier covering group calls of up to 60 minutes.

Desktop email client with a built-in calendar, address book and OpenPGP encryption for outgoing messages.

Low-latency voice chat for gaming and teamwork, running on servers that anyone can host themselves.

Multi-protocol chat client that keeps XMPP, IRC and other accounts in one buddy list, extended through plugins.

Desktop app for Rocket.Chat workspaces, able to hold several self-hosted or cloud servers in one window.

Encrypted messenger that identifies accounts by a random ID instead of a phone number, routed over a node network.

End-to-end encrypted messenger whose desktop app links to a phone account and keeps message keys on the device.

Messenger with no account identifiers at all: contacts are added through one-time invitation links or QR codes.

Team chat organised into channels and threads, with a free tier that keeps the most recent 90 days of history.

Voice chat client for hosted servers, with a permission system that controls who may speak in each channel.

Native desktop client for Telegram, with cloud-stored chat history that appears on every signed-in device.

Swiss encrypted messenger paid for once rather than by subscription, with accounts that need no phone number.

Encrypted mail service with a desktop client that keeps mailbox contents and the search index encrypted on device.

Messaging and calling app tied to a phone number, with a desktop client that mirrors chats from the mobile app.

Terminal chat client built around IRC, extended with scripts in Python, Perl, Ruby and other languages.

Desktop build of the phone-number based messenger, running as a companion device linked to the mobile account.

End-to-end encrypted messenger with a free personal plan covering chats, calls and screen sharing on desktop.

Vietnamese messaging app whose desktop build adds large file transfers, screen capture and task assignment.

Video meeting client whose free plan hosts up to 100 participants with a 40-minute limit per meeting.

Team chat that files every message under a named topic inside a channel, keeping parallel discussions apart.