A Figma plugin that fills text layers with locale-correct sample data, so layouts break in the studio rather than in production.

A layout that will break under a Turkmen surname or a German compound noun looks finished right up until it ships.
Names carry the length and structure of their language; dates, phone numbers and currencies follow local convention rather than being translated.
Gender, name format, date range, review category and star rating are all specifiable — because the useful test is a specific edge case, not a random one.
No network access, so the plugin stays usable inside teams where data handling is restricted.

Ten releases, most recently adding Spanish (Mexico).
Turkmen support drew unprompted thanks from users it was built for.
Text-length and formatting problems surface in design, not development.
