Lens
Desktop app for Kubernetes cluster management. Electron-based. Mirantis-acquired 2020. Built-in Prometheus metrics, Helm chart management, multi-cluster. Free + paid (Lens Pro).
Mainstream since ~2019. Open Source Lens was fully free until 2022, then "Lens Desktop" paywall ("Subscriptions" for commercial users 5+ employees). Community reaction: spawned OpenLens fork (commercially free) + Headlamp + alternatives. Pro features: SSO, audit log, team policies. Mainstream features in free: terminal, log tail, exec-into-pod, port-forward, YAML edit, metric graphs. Competitor: Rancher UI (multi-cluster + multi-tenant), Headlamp (open source), kubectl-command-line purists.