* [tldts v7.4.0](https://github.com/remusao/tldts) – JavaScript library for extracting hostnames, domains, public suffixes, and subdomains from URLs.

* [tldx v1.4.0](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.

* [quien v0.10.0](https://github.com/retlehs/quien) – Interactive TUI WHOIS and network lookup tool with tabbed views for DNS, mail, TLS, HTTP headers, and tech stack detection.

* [free-email-domains v1.9.15](https://github.com/Kikobeats/free-email-domains) – Comprehensive list of free email domains.

* [Domain Registry 260602](https://github.com/internetee/registry) – Full-stack top-level domain (TLD) management platform for registries and registrars.