In Digimon series, Fragarach is a extensible greatsword carried by Slayerdramon a - Mega level - Dragon Man Digimon.
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Fragarach appears in the Dungeons and Dragons module The Temple of Elemental Evil as a sword that never misses and "answers" any strike to the wielder with a strike of its own.
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In Diane Duane's novel A Wizard Abroad (as part of her Young Wizards series), Fragarach is used by Annie Callahan as part of a reenactment of the Second Battle of Magh Tuireadh.