There are many alternatives to AIM for Windows and since it's discontinued a lot of people are looking for a replacement. The best open source Windows alternative is Signal. If that doesn't suit you, our users have ranked more than 50 alternatives to AIM and 14 are open source and available for Windows so hopefully you can find a suitable replacement. Other interesting open source Windows alternatives to AIM are Pidgin, Jitsi Desktop, Zulip and Franz.
Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
Ayttm is an instant messaging (aka chat) client that provides all-in-one chat functionality for several major instant messaging services from one simple program. Ayttm "Contacts" allow you to refer to several accounts of the same person from a single contact name...
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