ISIM messenger is described as 'Connect with your friends on one simple platform. Use ISIM to combine all of your contacts from Skype, Google+ and Facebook. Staying in touch has never been this easy' and is a instant messenger in the social & communications category. There are more than 10 alternatives to ISIM messenger for a variety of platforms, including Mac, Windows, Linux, BSD and iPad apps. The best ISIM messenger alternative is Pidgin, which is both free and Open Source. Other great apps like ISIM messenger are Wire, Messenger, Trillian and Empathy.
Pidgin is a chat program which lets you log into accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on XMPP and sitting in an IRC channel at the same time.
Secure communication platform featuring encrypted chats and calls, file and media sharing, self-deleting messages, device verification, group collaboration, and customizable settings. Supports use across multiple devices with no phone number required for access.
Provides comprehensive communication features including group video calls, voice calls, fast messaging, photo sharing, and location mapping. Access through mobile and web platforms with real-time notifications, ensuring seamless interactions using multimedia tools.
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.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
One app for all your messaging.
WhatsApp, Messenger, Telegram, Skype, Zoom, Google Hangouts, Gmail, Slack, Facebook, Facebook Pages, Instagram, Twitter, Outlook, SnapMap, WeChat, LinkedIn, HipChat, and ChatWork.
Kopete is an instant messenger supporting AIM, ICQ, Jabber, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use.
qutIM - free open-source multiprotocol ( ICQ, Jabber/GTalk/Ya.Online/LiveJournal.com, Mail.Ru, IRC )
Messenger for Desktop is a wrapper for the official client messenger.com. Therefore it works like a regular browser which can only navigate to the messenger.com web app. MFD doesn't touch your messages, account or personal data. All that is handled securely by Facebook.
Sim-IM, Simple Instant Messenger, is a multiple protocol instant messenger for MS Windows, GNU/Linux, FreeBSD. Sim-IM supports Jabber/XMPP, Google Talk, ICQ and AIM (Oscar), Yahoo! Messenger and Microsoft Messenger (MSN)
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