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The Wayback Machine is a web-archiving service operated by the Internet Archive, a U.S.-based nonprofit. It captures and preserves web pages through site crawls and user-submitted “Save Page Now” URLs, storing archived content as WARC/HTTP captures with derived renders. Its indexed archive, which dates back to the mid-1990s, provides playback of historical page states and access to archived websites and other digital content. The service includes CDX indexing, a query/API for retrieving URLs by date, support for the Memento protocol, and bulk access through archive.org.

PublicWWW is a web source-code search engine that indexes HTML, JavaScript and other client-side code so users can find websites by code snippets, tags, analytics, trackers and technologies. It is operated as PublicWWW and is commonly used for digital marketing and affiliate research, competitive analysis, and security or developer research.

Ahrefs is a digital marketing and SEO platform developed by Ahrefs Pte. Ltd. It provides tools for backlink analysis, keyword research, rank tracking, site auditing, and content research. Ahrefs maintains a large web and backlink index used for competitive analysis and search research.

Wappalyzer is a web technology profiler and data company that identifies the software, analytics, frameworks, and server technologies used by websites. It offers a browser extension, command-line tools, and a commercial API and dataset for technographic prospecting, CRM enrichment, and market intelligence. The service is provided from wappalyzer.com.

Semrush is a marketing and brand-visibility platform for SEO, AI search, PPC, social media, market research, and local SEO. It provides keyword research, competitor and market analysis, backlink analysis, rank tracking, technical site audits, traffic and market data, content creation tools, and marketing reports. The platform also tracks brand visibility in AI-generated answers and can connect Semrush data to AI assistants through Semrush MCP and its API.