Try them yourself
Instead of just reading the code, try it. Three of these actually run for real; the other four need real infrastructure I can't safely expose publicly, so they walk through exactly what a real run looks like instead.
Live tools
Simulated walkthroughs
These need real infrastructure to do anything - can't safely expose that publicly, so here's exactly what a real run looks like.
Zabbix Setup
Zabbix Automation
Step through the real deployment flow, on canned output.
cPanel Migration
cPanel Migration
Watch a simulated account transfer, step by step.
iptables
iptables Script
See a simulated firewall rule change, backup to rollback.
Pingdom → Zabbix
Pingdom → Zabbix
Watch a simulated sync between the two platforms.