SauceNAO is a reverse image search engine. The name 'SauceNAO' is derived from a slang form of "Need to know the source of this Now!" which has found common usage on image boards and other similar sites.
tinysearch is a lightweight, fast, full-text search engine. It is designed for static websites.
tinysearch is written in Rust, and then compiled to WebAssembly to run in a browser. It can be used together with static site generators such as Jekyll, Hugo, Zola, Cobalt, or Pelican.
The test index file of my blog with around 40 posts creates a WASM payload of 99kB (49kB gzipped, 40kB brotli).
Only finds entire words. As a consequence there are no search suggestions (yet). This is a necessary tradeoff for reducing memory usage. A trie datastructure was about 10x bigger than the xor filters. New research on compact datastructures for prefix searches might lift this limitation in the future.
Since we bundle all search indices for all articles into one static binary, we recommend to only use it for small- to medium-size websites. Expect around 2 kB uncompressed per article (~1 kb compressed).
A search engine for components in the catalogs of several dozen electronic component manufacturers and distributors. You can also upload a bill of materials and get shopping carts on any number of those distributors.
This is an independent DIY search engine that focuses on non-commercial content, and attempts to show you sites you perhaps weren't aware of in favor of the sort of sites you probably already knew existed.
The software for this search engine is all custom-built, and all crawling and indexing is done in-house.
This search engine isn't particularly well equipped to answering queries posed like questions, instead try to imagine some text that might appear in the website you are looking for, and search for that.
Where this search engine really shines is finding small, old and obscure websites about some given topic.
REST API: https://memex.marginalia.nu/projects/edge/api.gmi
E-mail the admins for an API key.
Intelligence X differentiates itself from other search engines in these unique ways:
The search works with selectors, i.e. specific search terms such as email addresses, domains, URLs, IPs, CIDRs, Bitcoin addresses, IPFS hashes, etc.
It searches in places such as the darknet, document sharing platforms, whois data, public data leaks and others.
It keeps a historical data archive of results, similar to how the Wayback Machine from archive.org stores historical copies of websites.
You can use Intelligence X to perform any kind of open source intelligence. We deliver fast, high-quality results and make the deepest parts of the internet accessible with a few clicks. Intelligence X searches billions of selectors in a matter of milliseconds. Combined with our data archive this is a powerful new tool.
Fast, typo tolerant search engine for building delightful search experiences. Has an API and a number of protocol modules for different languages. Written in C and C++.
Designed for people who don't want to fuck with Elasticsearch, they just want a document search engine. Lightweight, powerful, scalable. Tries to have smart defaults. Single executable. Uses far less memory than the usual Java-based search systems do. Tries to be flexible so you can build the search engine you need.
Looks like you define a JSON document with the stuff you want to be able to search and throw it over to the engine. Means you'll need to write some front-end tooling to extract the data you want to index, which might not be that big a deal. It could just be some shell scripts.
An open source search engine for indexing and searching Peertube instances.
Source code: https://framagit.org/framasoft/peertube/search-index/
MeiliSearch is a powerful, fast, open-source, easy to use, and deploy search engine. The search and indexation are fully customizable and handles features like typo-tolerance, filters, and synonyms. For more details about those features, go to our documentation. Has its own web search interface as well as an API. Searches its indices as you type. Smart enough to figure out typos and synonyms. Customizable. Create an index, then upload documents to it.
A small service which indexes Tor hidden services by proxying for YaCy (which does the actual heavy lifting).
A search engine for open and unsecured Amazon S3 buckets.
Has a REST API. Have a key.
An open source search engine for social media, by one of the developers of YaCy. Can monitor Twitter, Youtube, Github,
Can return JSON as well as RSS for search results.
Source code: https://github.com/loklak/loklak_server
Free Software for your own Search Engine, Explorer for Discovery of large document collections, Media Monitoring, Text Analytics, Document Analysis & Text Mining platform based on Apache Solr or Elasticsearch open-source enterprise-search and Open Standards for Linked Data, Semantic Web & Linked Open Data integration.
Usage tutorial here: https://www.opensemanticsearch.org/doc/tutorial
Of course it has an API: https://www.opensemanticsearch.org/doc/admin/rest-api
A massive online database of default passwords for networking hardware, embedded devices, and operating systems.
A free, open source, distributed search engine using peer to peer communication methods for both search and indexing. Fully decentralized. Written in Java. Install it, start it up, and turn it loose. Can also be used to set up stand-alone nodes for use on intranets, darknets (there's a YaCy instance somewhere in the Tor darknet), and probably single hosts (as a personal search engine).
A search engine for Tor hidden services. The problem is that it's on the public Net so if you don't want your services known you'll have to take additional measures. It also exposes your activity on the public Net so don't think that you'll have much privacy.
Mairix is software for indexing and searching your e-mail queues. Can handle Maildir/, MH, and mailbox mail queues. Runs incrementally on every new e-mail. Search results go into virtual mail folders in your mail client. Extremely fast.
The developer signup page for Full Contact, which is a search engine and database for social media and personal information. You can get an API key for it.
An interactive visual search engine. An interactive mind map that links to other mind maps as well as sites. Designed to be explored but can also be searched.
Public instance here: https://learn-anything.xyz/