Gabber is the style of electronic dance music and a subgenre of hardcore techno, as well as the surrounding subculture. Gabber may also refer to: Computing Gabber (instant messaging client), a free software and open-source GNOME client for instant messaging XMPP network. People with the surname Ofer Gabber, a French mathematician. See also Gab (disambiguation) Gabba (disambiguation) Jabber (disambiguation)