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Petzl - Rollclip
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The Petzl Rollclip range are karabiners with integrated pulleys for a variety of functions.
In it's simplest form the Type A snapgate, you can clip this to a hand ascender when ascending with a grigri, redirecting the dead rope of the grigri over the pulley, this makes it far more efficient to ascend.
The type Z option has a conventionally orientated gate opening and the screw gate function is lighter than the combined weight of a Petzl Partner pulley and OK screw gate used in a crevasse rescue kit and works with a Tibloc.
An interesting piece of kit, which allows for a good bit of creativity in rigging situations.