Free Cisco network engineering tools

Cisco Config Diff Tool: Compare two Cisco IOS or NX-OS configs and get a visual diff with an auto-generated migration script. Free, no login required.

IOS to NX-OS Configuration Translator: Translate Cisco IOS configs to NX-OS and back. Feature detection, interface renaming, OSPF/BGP/VRF conversion, manual-review warnings. Free.

Cisco Config Sanitizer: Strip passwords, SNMP community strings, TACACS/RADIUS keys, and crypto material from Cisco configs before sharing them. Free, no login.

Cisco Config Template Manager: Create reusable Cisco config templates with variables, per-device tables, interface port mapping, and bulk ZIP download. Free, no login required.

Subnet and VLAN Provisioning Planner: Plan VLAN subnets inside a container prefix: next-fit allocation, no overlaps, and ready-to-paste IOS XE SVI and DHCP pool config. Free.

Config Compliance Checker: Score a Cisco config 0-100 against a hardening rule pack: failed lines, why each matters, and the fix. Six packs. Free, nothing stored.

BGP Best-Path Explainer: Step through Cisco IOS BGP best-path selection rule by rule: edit paths or paste show ip bgp, see who is eliminated and why. Free.

Interface Cleanup Auditor: Paste switch output and get a reviewed cleanup plan: which ports to reclaim, which are stale, which are hands-off, with the evidence. Free.

Network Script Builder: Generate a SecureCRT script that SSHes to your device list, runs the show commands you pick, and saves output per device. Free, no login.

SanitizeDrop: Offline Config Sanitizer: SanitizeDrop is a free desktop app that strips passwords, SNMP strings, and crypto keys from Cisco configs offline. macOS and Windows.

Network Configurator: A single-file Python app that runs show commands and config pushes against your own devices from your own machine. Free Lite tier.

NetOps Widgets: A single-file Python app with widgets for Catalyst Center reads, ISE MAB endpoint pushes, and DHCP reservations. Free Lite tier is read only.

CiscoTools Pro: CiscoTools Pro adds bulk CSV workflows, exports, saved state, and a personal API key on top of the free Cisco tools. The free tools stay free.