Adium is a free, open-source instant messaging application for macOS that connects to XMPP (Jabber), IRC and other services. It is a third-party client based on the libpurple protocol library, with tabbed chat windows, themeable message views, macOS Contacts integration and OTR encryption. It is developed by volunteers and released under the GNU GPL.
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Altus is an open source project with code, documentation, and setup resources for chat and messaging.
Matrix-based secure messaging app for encrypted team chats, rooms, and federation.
Open source team chat platform for messaging, collaboration, and self-hosted communication.
Signal is a messaging application focused on privacy. Its source page describes end-to-end encryption via the open source Signal Protocol, and support for text, voice messages, photos, videos, GIFs, files, voice and video calls and group chats. It is described as free, with no ads or trackers, and as an independent nonprofit.
Telegram is described as a cloud-based mobile and desktop messaging app with a focus on security and speed. It offers apps for iPhone/iPad, Android, PC/Mac/Linux and macOS, and states that messages are heavily encrypted and can self-destruct.
Encrypted messenger built on decentralized routing for private chats without phone numbers.
Distributed communication app for encrypted calls, messages, video, and file sharing.
A cloud GPU password recovery and credential auditing service for data the user owns or is authorized to test. It supports Office, ZIP, PDF, Wi-Fi captures, NTLM and AD hashes, with a free Basic Search and optional paid custom GPU jobs and unlocks. An authenticated REST API and MCP tools are documented. Uploaded files are deleted after hash extraction.