* [free-email-domains v1.10.0](https://github.com/Kikobeats/free-email-domains) – Comprehensive list of free email domains.

* [whois v1.3.0](https://github.com/KincaidYang/whois) – Performs domain, IPv4/IPv6 and ASN registration-data queries across TLDs that permit public lookups.

* [tldts v7.4.11](https://github.com/remusao/tldts) – JavaScript library for extracting hostnames, domains, public suffixes, and subdomains from URLs.