sticky software
n. Software that users stick with over the years because the programs fulfill a need or perform a service.

Example Citation:
"I've been talking about 'sticky software' for years. By that, I mean those relatively few programs that really stick to our hard disks — the ones we don't install, rave about, gradually cool on, and finally wipe off the disk. From my observations, I think PointCast is becoming the poster child for nonsticky software in the nineties." —Jim Seymour, PC Magazine

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