Adium is described as 'free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under the GNU GPL and developed by the Adium team' and is a well-known app in the Social & Communications category. There are more than 50 alternatives to Adium for a variety of platforms, including Mac, Windows, Linux, Android and iPhone. The best alternative is Element, which is both free and Open Source. Other great apps like Adium are Tox (Free, Open Source), Pidgin (Free, Open Source), HexChat (Free, Open Source) and Facebook Messenger (Free).
Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.
Pidgin is an easy to use, multi-protocol chat client client used by millions. Connect to AIM, MSN, Yahoo, XMPP, and more chat networks all at once. It has built-in support for NSS, offering client-to-server message encryption for protocols that support it.
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Some users think Pidgin is a great alternative to Adium, some don't.
HexChat is an IRC client based on XChat for Linux , but unlike XChat it’s completely free for both Windows and Unix-like systems. HexChat was originally called XChat-WDK which in turn was a successor of freakschat.
Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone.
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Trillian vs Adium opinions
pros, cons and recent comments
It uses a Trillian account, not Jabber, AIM, MSN, etc
Bitmessage is a P2P communications protocol used to send encrypted messages to another person or to many subscribers. It is decentralized and trustless, meaning that you need-not inherently trust any entities like root certificate authorities.
ICQ is one of the oldest instant messengers. First developed by the Israeli company Mirabilis, sold to AOL, sold again and currenly owned by the Russian "mail.ru" group (known for one of the largest social networks).