jabberd is a Jabber/XMPP instant messaging server. It implements XMPP-Core (RFC3920), XMPP-IM (RFC3921), and a range of protocol extensions: XEP-0012, XEP-0016, XEP-0030, XEP-0049, XEP-0054, XEP-0077, XEP-0079, XEP-0092, XEP-0114, XEP-0138, XEP-0153, XEP-0157, XEP-0160, XEP-0191, XEP-0192, XEP-0193, XEP-0198, XEP-0199, XEP-0202, XEP-0203.
JBuddy Developer Tools is a robust suite of APIs and software development frameworks for creating instant messaging applications and solutions. It is comprised of the JBuddy SDK, JBuddy Bot Builder, and JBuddy Bot Framework. The JBuddy SDK is a unified IM client API supporting public IM services including AIM, ICQ, Windows Live (MSN), Yahoo Messenger, Google Talk, and enterprise IM servers including Lotus Sametime, Microsoft Live Communications Server (LCS 2005), Microsoft Office Communications Server (OCS 2007), and XMPP (Jabber) servers. The core JBuddy SDK implementation and APIs are available in Java while a tight C++ wrapper exposes the JBuddy APIs for Microsoft COM and .NET. The JBuddy Bot Builder and JBuddy Bot Framework are built on top of the JBuddy SDK and greatly simplify building, testing, and deploying powerful IM Bots.
Messenger++ is a multi-protocol instant messaging client for Android. It features multi-protocol support (currently: XMPP, Facebook(XMPP), Google Talk(XMPP), VK, SMS) + audio calls if supported by the protocol. The UI is optimized for tablets. It is a Maven-based project with Robolectric tests built by Travis CI.
123 Web Messenger can add a Facebook-like messenger bar to the bottom of the browser window of a visitor to your Web site, keeping your visitors active and connected. It offers both Web-based IM and an optional desktop IM application. 123 Web Messenger supports text and video chat options. The Web-based IM includes an invitation button in the user list page to initiate a one-to-one private chat.