GoodGopher.com is a search engine that provides two submission forms: one for website indexing requests and one for petition indexing requests. Website indexing submissions require a submitter’s URL, webmaster email and security code, while petition submissions require a petition title, URL, description and security code.
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IndexKings is a free rapid URL indexing service that submits user-provided URLs to over 15,000 statistic sites to generate one-way backlinks and speed up indexing by search engines including Google. It also offers additional tools including a ping service and link checker, and had indexed over 2,147,483,647 URLs as of the snapshot. The site also lists a paid Quora profile submission service priced at $2.
Sentio is a developer platform for crypto data, offering an indexing SDK, real-time data indexing, custom analytics, dashboards and alerting, plus a single-stepping debugger for transactions. It is presented as an end-to-end observability platform for monitoring, analyzing and diagnosing decentralized applications.
Bing Webmaster Tools helps research keywords, search demand, related terms, and content opportunities for SEO.
Microsoft tool for monitoring website search performance, indexing status, and SEO insights.
Google Search Console helps monitor indexing, search performance, crawl data, and site visibility.
This arXiv paper by Dirk Lewandowski and Philipp Mayr provides a critical review of Bergman's 2001 study on the Deep Web. It introduces the concept of the Academic Invisible Web, defined as databases and collections relevant to academia but not searchable by general-purpose internet search engines, and reviews approaches for indexing it. The authors question Bergman's size estimate and suggest collaboration.
Recoll WE is a Firefox extension that enqueues visited web pages for storage and indexing by the Recoll desktop search application. It requires Recoll version 1.23.5 or later on Linux, 1.26.2 on Windows or macOS. Users must configure the webdownloadsdir variable in recoll.conf if the download directory differs from the default. The extension triggers the download dialog on first save and can automate subsequent saves.
Alldle is a browser portal indexing daily games, including word games, puzzles, logic challenges and trivia. The site lists over 1,000 games across 17 categories and shows most-played and new-release games such as Craft Connections, ZoomOut and Cutle.
Academic search engine indexing repository records and open-access research from many countries.
ICIJ document analysis platform for searching, indexing, and investigating large document collections.
Search engine indexing digitized historical newspaper collections from libraries and archives.
Epstein Exposed is a public-interest research database indexing publicly released documents from the Jeffrey Epstein case. It offers searching across persons, documents, flights, and emails, plus a relationship map. It is described as free, donor-supported, and open-source.
Everything is a Windows file search utility that locates files and folders by name instantly. It offers quick filename indexing, quick searching, minimal resource usage and real-time updating. It can be installed or run as a portable executable, with installer and portable ZIP builds available for download.
Fluent Search is a keyboard-driven search and productivity tool for Windows. It launches apps, finds files through indexing, searches browser history and bookmarks, runs commands, searches the web, switches windows, and performs calculations from one interface. Search tags narrow results, and plugins extend it. Builds are offered for Windows x64 and ARM64.
FSTA is a database from IFIS for literature searching in food science and related fields. It indexes journal articles, trade publications, conference proceedings and patents, with new content added weekly. Searches use a food thesaurus for indexing, and a free trial is offered for organisations.
Free software indexing and searching system.
Index Islamicus Online is a classified bibliography of publications in European languages on Islam and the Muslim world. It contains over 750,000 records of articles, books and online resources, with over 5,000 journals surveyed, and indexing down to article and chapter level. Newspaper and grey literature are excluded. Users may submit missing items, with inclusion at editors' discretion.
Decentralized search engine focused on indexing content from IPFS and web3 sources.
Kubeflow is described as the cloud native AI platform, composed of modular open source projects forming a Kubernetes-native stack for data and AI workloads. Its subprojects include Kubeflow Pipelines for building and deploying portable machine learning workflows, Kubeflow Trainer for distributed AI training and LLM fine-tuning, Kubeflow Katib for automated machine learning, Kubeflow Notebooks for interactive development environments, and Kubeflow Hub for indexing models and metadata. It is a Cloud Native Computing Foundation project.
LlamaIndex is a platform focused on AI agents for document optical character recognition (OCR) and workflow automation. Its LlamaParse tool is designed to process complex documents including those with tables, charts and images, and can perform parsing, extraction, splitting, classification and indexing of document content.
Merklemap is a subdomain and certificate transparency search engine. It collects Certificate Transparency data by live tailing CT logs and indexing certificates, and offers a web interface, an API, and a CLI for searching subdomains and SSL/TLS certificates.
Newznab is a Usenet indexing web application with community features. It groups messages for user-friendly access and uses the Sphinx Open Search Server for searching Usenet articles. It includes SEO-friendly URL rewriting and simple CMS features for adding content pages. Documentation and support are provided with the plus version; the free version includes basic install resources in a README file.
OSINT search engine indexing exposed internet assets, IPs, domains, and network intelligence.