KastellofficialSecurityMonitoringCloud PlatformskastelldevAlicenseAqualityAmaintenanceServer security auditing (413 checks, 29 categories), production hardening, and fleet management. Supports Hetzner, DigitalOcean, Vultr, and Linode. Updated 2 days ago (2026-08-12 20:23 UTC)1715856Apache 2.0