the sovereign stack.
European, Icelandic, and open-source tools Kastro evaluates, builds with, or recommends when they fit the job.
Infrastructure
Proxmox VE
AustriaOpen-source server virtualization — useful for private-cloud options and VMware exit planning
Hetzner
GermanyEuropean cloud and dedicated servers — useful comparison point for hosting options
Coolify
Open SourceOpen-source app platform for small teams that want practical deployment without a heavy control plane
Security
Wazuh
SpainOpen-source SIEM, XDR, and endpoint protection — our baseline security layer
TheHive
FranceSecurity incident response and case management platform
Cortex
FranceAnalyzer and responder engine for incident response workflows around TheHive
Observability
Zabbix
LatviaInfrastructure monitoring with long operational history and strong fit for self-hosted environments
Prometheus
Open SourceMetrics collection and alerting for services, applications, and infrastructure
Grafana
SwedenDashboards and visualization for metrics, logs, and operational evidence
DevOps & IaC
OpenTofu
EU / CNCFOpen Terraform-compatible infrastructure as code without HashiCorp BSL lock-in
GitLab
Open CoreSelf-hostable Git, CI/CD, registry, and release workflow for teams that need control over code and pipelines
Operating Systems
Ubuntu Server LTS
UKStable server baseline with predictable lifecycle support for infrastructure workloads
Fedora Workstation
Open SourceLinux workstation option used internally where full control and rapid security updates matter
Collaboration
Nextcloud
GermanySelf-hosted file sync, groupware, and office suite — our M365 replacement
ONLYOFFICE
EUDocument editing layer often paired with Nextcloud for browser-based collaboration
Element / Matrix
UKFederated messaging option for teams that need encrypted chat outside a single SaaS vendor
Jitsi Meet
Open SourceSelf-hostable video meetings for lightweight calls without forcing guests into an account system
Identity & Secrets
Vaultwarden
Open SourceSelf-hosted Bitwarden-compatible password manager for smaller controlled environments
Proton Mail
SwitzerlandSwiss email option with zero-access architecture for organizations that need a European alternative
want a stack that fits the job?
Tell Kastro about your infrastructure and get a practical shortlist of European, Icelandic, and open-source options worth evaluating.