IaC: Pulumi or CDK for Terraform, Ansible
Containers: Helm & Kubernetes & Docker, LXD
Public cloud: AWS, Linode & LKE
On-premise cloud: OpenNebula & KVM
Monitoring: Zabbix, Netdata, Prometheus & Grafana, ELK
CI/CD: Jenkins (including Groovy), SonarCube
DBMS: IBM DB2 & PostgreSQL via nHibernate or DevExpress XPO, Redis
OS: Debian, Red Hat or Centos, Devuan, Alpine, OpenBSD
Guest OS: ^above, Parabola, Gentoo, GUIX
Storage: HBA, iSCSI, OpenZFS, CEPH
Scripting: Bash, PowerShell, JavaScript, C# on .NET Core & Mono (on Linux with
cs-script.net)
BL: DevExpress XAF,
CSLA.NETGUI: DevExpress Universal