* [tldx v1.6.0](https://github.com/brandonyoungdev/tldx) – Domain availability research tool generating keyword-based permutations and checking availability across TLDs with regex support, presets, and streaming output.

* [parse-domain v8.4.0](https://github.com/peerigon/parse-domain) – Splits a hostname into subdomains, domain, and effective top-level domains.

* [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.

* [KLDNS 1.0.7](https://github.com/klsf/kldns) – 二级域名分发与 DNS 解析管理系统，提供用户注册、积分扣费、域名审核及解析记录与后台运维管理。