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ExactTarget/fuelux
As of March 2019, this repository is read-only as Salesforce has archived the FuelUX open-source UI framework and will no longer be supported.
FuelUX was a Bootstrap 3 extension library built by Salesforce/ExactTarget that added controls like wizard, repeater, scheduler, pillbox, and spinbox on top of jQuery. Salesforce archived it in March 2019 and explicitly tells you not to use it. This is a historical artifact, not a usable library.
The component set was thoughtful for its era — the repeater (data grid with list/thumbnail views), scheduler, and wizard covered patterns that Bootstrap 3 left entirely to you. AMD support via RequireJS was first-class when that mattered. The test suite is unusually thorough for a corporate open-source project of that period, with per-component test directories and both QUnit and Sauce Labs integration.
Depends on Bootstrap 3 and jQuery — both themselves in maintenance/legacy mode — so you're stacking three layers of dead weight. No security patches will ever land; any CVE in its dependencies is permanent. The documentation is gone except as a branch you'd have to build yourself with Jekyll, and the original authors have explicitly stated they have no memory of how it works. Adopting this in 2026 means you own the entire codebase with zero upstream support and no community.