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Adium is a free and open source instant messaging application for Mac OS X, written using Mac OS X's Cocoa API, released under the GNU GPL and developed by the Adium team.
Based on the libpurple protocol library, Adium can connect you to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services.
Adium supports ICQ, Jabber, Google Talk, IRC, Twitter and others. As well as Skype, Steam, WhatsApp and others through Third-party plugins
See Bundled Services and Third-party plugins
Download File Size: 21.1 MB
Eggdrop is the oldest Internet Relay Chat (IRC) bot still in active development. Originally created by Robey Pointer in December 1993 for use on a channel called #gayteen, it has spawned an almost cult like following of users.
It is a feature rich program designed to be easily used and expanded upon (using Tcl scripting) by both novice and advanced IRC users on a variety of hardware and software platforms.
Download File Size: 1.8 MB
Facebook Messenger 236.0
Texting and so much more.
Make video calls from your Mac. Video calling works with Chrome, Opera and Firefox.
Download File Size: 2803.7 MB
https://www.messenger.com Video calling works only in Chrome, Opera and Firefox, not in Safari
https://www.facebook.com/home.php If you don't want to install Messenger on your iPhone, but still want to check or maybe send a quick message, go here. Add to home screen.
Simple way to communicate and nothing extra. New design, free sound and video calls, group chats and much more!
Download File Size: 68.8 MB
Download File Size: 121.3 MB
Your text mode chatting application since 1999.
IRC built-in. Multi-protocol friendly for module authors.
Shipped-by-default Perl scripting with a wide range of available extensions.
Integrates into the UNIX stack: Your window manager, your terminal emulator, your remote connection, your terminal multiplexer, your IRC bouncer, your IRC adapter.
Irssi is free software licensed under the GPLv2, available for Linux, BSD, Solaris, Apple, Cygwin, …
Download File Size: 1.8 MB
Homebrew installation: $ brew install irssi
LimeChat is a full featured IRC client that can connect to multiple servers in a window. It is fast and stable. Also it has rich keyboard shortcuts for your comfortable operations.
Download File Size: 2 MB
Download File Size: 2 MB
Send free one-on-one and group texts to your friends anytime, anywhere!
Call your friends and family as often as you want, for as long as you want! Free international voice and video calls make it easy to stay connected with your loved ones.
Currently available for iPhone, iPad, Android, Windows Phone, Mac and Windows PC.
Download File Size: 67.1 MB
Download File Size: 289.9 MB
With Messages for Mac, you can send unlimited messages to any Mac, iPhone, iPad, or iPod touch that uses iMessage, Apple's secure-messaging service. iPhone owners can use it for SMS and MMS messages, too.
Messages no longer supports Jabber/XMPP as of Messages 12.0 for Mojave
Psi is an instant messaging application for Windows, Linux, and Mac OS X that connects to the free, open Jabber IM network (also known as XMPP), including Google Talk.
Download File Size: 80.7 MB
Privacy is possible. Signal makes it easy.
Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real-time with all of your friends at once, and share media and other files with complete privacy. The server never has access to any of your communication and never stores any of your data.
* Say Anything - Signal uses an advanced end-to-end encryption protocol that provides privacy for every message every time.
* Open Source - Signal is Free and Open Source, enabling anyone to verify its security by auditing the code. Signal is the only private messenger that uses open source and peer-reviewed cryptographic protocols to keep your messages safe.
* Be Yourself - Signal uses your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose.
* Group Chat - Signal allows you to create encrypted groups so that you can have private conversations with all of your friends at once. Not only are the messages encrypted, but the Signal server never has access to any group information like the membership list, group title, or group icon.
* Fast - The Signal protocol is designed to operate in the most constrained environment possible. Messages are delivered quickly and reliably.
* Speak Freely - Make crystal-clear voice and video calls to people who live across town, or across the ocean, with no long-distance charges.
Download File Size: 114.4 MB
Download File Size: 148 MB
Skype is the next phenomenon from the people who brought you KaZaA. Just like KaZaA, Skype uses P2P (peer-to-peer) technology to connect you to other users - not to share files this time, but to talk and chat with your friends.
Our software's quick and easy to install. Just download Skype, register (you can also use your Microsoft Messenger account) and within minutes you can plug in your headset, speakers or USB phone and call your friends. The calls have excellent sound quality and are highly secure with end-to-end encryption. You don't even need to reconfigure your firewall or router. It just, you know... works.
You can also use our SkypeOut function to make calls to friends who only have a landline or mobile phone anywhere in the world at local rates. You can even transfer files of up to 2 gigabytes.
Download File Size: 101.9 MB
Download File Size: 140.9 MB
Why switch to Telegram?
Private - Telegram messages are heavily encrypted and can self-destruct.
Cloud-Based - Telegram lets you access your messages from multiple devices.
Fast - Telegram delivers messages faster than any other application.
Distributed - Telegram servers are spread worldwide for security and speed.
Open - Telegram has an open API and protocol free for everyone.
Free - Telegram is free forever. No ads. No subscription fees.
Download File Size: 27.7 MB
Download File Size: 164.8 MB
Interact with Internet Relay Chat (IRC) chatrooms on macOS
Beautiful Interface - Textual includes two elegantly designed dark and light variants of the user interface which have been refined all the way down to the very last pixel.
Powerful Textual - supports very powerful modern technologies such as native IPv6, the latest IRCv3 specifications, client-side certificate authentication, and much, much more in a easy to navigate, clutter free environment.
Privacy is valued - Textual protects your privacy by leveraging widely accepted, proven technologies such as Off-the-Record Messaging (OTR) to ensure that the only people reading your conversations are those that you intend to.
Customizable - Textual takes customization to the next level with styles created using well documented, open standards in addition to addons built using a multitude of programming languages such as AppleScript, Objective-C, PHP, Python, Perl, Ruby, Shell, and Swift.
Download File Size: 13.6 MB
We connect people, no matter who they are or where they are from.
Make calls, send messages and much more - freely and securely.
Audio and video calls
High-quality calls for a quick "hello" or a much-needed face-to-face
Download File Size: 128.7 MB
Download File Size: 260.3 MB
WeeChat is a fast, light and extensible chat client. It runs on many platforms (including Linux, BSD and Mac OS).
- modular: a lightweight core with plugins around
- multi-protocols: IRC and Jabber (other soon)
- extensible: C plugins and scripts (Perl, Python, Ruby, Lua, Tcl and Scheme)
- free software: released under GPLv3 license
- fully documented: user's guide, API, FAQ,.. translated in many languages
Download File Size: 4.2 MB
Homebrew installation: $ brew install weechat
With WhatsApp, you'll get fast, simple, secure messaging and calling for free, available on phones all over the world.
Voice and video only available on phones, not on your Mac or the web.
Download File Size: 110.4 MB
Download File Size: 116.3 MB - App Store
Download File Size: 155.8 MB