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Back-It, from Gazelle Systems, is a fast and compact hard disk backup utility. It was sometimes part of OEM system bundles. It was kind of low-end, and changed backup formats between releases but otherwise did what it was supposed to do.
OPTune is a disk optimizer, file system repair tool, and disk tester. It also includes an tool that can change the low-level format sector interleave on MFM/RLL drives, similar to Spinrite.
Gazelle Systems Q-DOS is a text mode based file manager for DOS. Q-DOS is a simplified file manager that presents all DOS functions visibly. It competed against many other file managers including Norton Commander and Xtree
Rapid: File Manager is a Windows based file manager from Gazelle Systems, the makers of Q-DOS.