Currently, at least these public projects use gloox:

• Kinapsis: a multi-protocol IM client for KDE
• XFireGateway: a gateway that bridges Jabber with the XFire network
• FatRat: a Qt4-based download manager for Linux
• CJWPres: C++ Jabber Web Presence
• qutIM: A multi-protocol IM client using Qt4
• Juick: A microblogging site
• Spectrum: A multi-network transport/gateway for XMPP

Amongst others, gloox is also used by: