If you are looking to create an instant messenger for Android, this code should get you started somewhere. Excerpt from the source : This is a simple IM application runs on Android, application makes http request to a server, implemented in php and mysql, to authenticate, to register and to get the other friends’ status … Read more
OpenFire is a great XMPP Server. Fast, stable, wide community support with lots of extensions, both commercial and OSS. Not to mention, integrates with LDAP-based systems, even with Active Directory, so no separate logins are necessary. Used it, even modified its source to add some features very specific to one project I were in (in … Read more
As Iain, answered you can install an XMPP (also known as Jabber) server at your local network and have your workers use that server. There are many server implementations out there, both proprietary and open source. Then you may have your XMPP server communicate with other XMPP servers (gmail.com, jabber.org, someothercompany.com) so that jack@yourcompany.com will … Read more