OS: Alt, Redos, Debian, Ubuntu, Windows
Lang: Bash/Go
DBa2: Postgresql, Cassandra, SQL Server, MySQL
Containers: Docker
Orchestration: Docker-swarm, Kubernetes
Monitoring: Zabbix
CI/CD: Gitlab, Jenkins
Manage conf: SaltStack, Ansible
Web Server: Nginx, Tomcat, Jetty, Apache
Balancer: Haproxy
Queues: ActiveMQ, RabbitMQ, Kafka
Repo: Nexus, Harbour
Build tools: Gradle, Dotnet, Maven, Yarn
Firewall: Iptables, Ufw, Ssl cert's
Another: OSM Map tiles, Nominatim, Gitlab server, Ntp, Mail, JSON/CSV/XML/YAML