Gimlet was an open-source application deployment platform for Kubernetes, aimed at small teams who wanted a Heroku-style UX on top of their own clusters without adopting all of Argo CD or a full internal developer platform. Its core was OneChart, a generic Helm chart that could model most 12-factor-ish apps through values files, plus a web UI that turned those values into GitOps commits and watched Flux reconcile them.
Under the hood, Gimlet used Flux for the actual reconciliation loop: the UI and API server produced manifests, committed them to a Git repo, and let Flux apply them. Environments were modeled as directories in the infra repo, and promotion between staging and production was a cherry-pick/PR workflow triggered from the dashboard. It also integrated with GitHub for build status and automatic deploys on new images.
The project was archived by its maintainers in 2024/2025 — per the website, “it was not sustainable to run it” — so it’s no longer an active option. It’s useful mostly as a reference for the “Flux + OneChart + a nice UI” pattern, which you can still assemble yourself. Teams looking for the same shape of product today typically land on Argo CD with generators, Kargo, or a Backstage-based internal portal instead.