Kubernetes has an extensible user interface with default functionality that describes the current cluster. See the README for more information.
Assuming that you have a cluster running locally at localhost:8080, as described here, you can run the UI against it with kubectl:
kubectl proxy --www=<kube-ui home>/app --www-prefix=/You should now be able to access it by visiting localhost:8001.
You can also use other web servers to serve the contents of the www/app directory, as described here.
When Kubernetes is deployed remotely, the api server deploys the UI. To access it, visit /static/app/ or /ui, which redirects to /static/app/, on your master server.