KastellofficialSecurityMonitoringCloud PlatformskastelldevAlicenseAqualityAmaintenanceServer security auditing (413 checks, 29 categories), production hardening, and fleet management. Supports Hetzner, DigitalOcean, Vultr, and Linode. Updated 4 days ago (2026-08-16 03:54 UTC)1715857Apache 2.0