- *uNix, windows server
- powershell, bash, cron, ansible
- LAMP, VDS, VPS, CMS, shops, billing, plugins
- MS sqlserver, postresql, mariadb
- docker, kvm/qemu, lxc
- MAIL/SMTP server
- L2, QoS, vLan, STP
- L3-L7, openvpn, antivirus, IPtables, route
- Vmware, ProxMox, hyper-v
- ZFS, CephFS, SAN, NAS, lvm, backup
- LTSP, x2go, noMachine, PXE, RDP, VNC
- AD, GPO, SCCM, Samba4/cifs, LDAP, RDS, RODS, DNS, DFS, AD FS, Print server