KastellofficialSecurityMonitoringCloud PlatformskastelldevAlicenseAqualityAmaintenanceServer security auditing (413 checks, 29 categories), production hardening, and fleet management. Supports Hetzner, DigitalOcean, Vultr, and Linode. Updated 3 days ago (2026-09-03 14:59 UTC)1721460Apache 2.0