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Gigablast
Nov 20 2017 -- A distributed open source search engine and spider/crawler written in C/C++ for Linux on Intel/AMD. From gigablast dot com, which has binaries for download. See the README.md file at the very bottom of this page for instructions.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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spyglass
A personal search engine: Create a searchable library from your personal documents, interests, and more!
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Gigablast - A search engine whose source code is available on Github. TMK, it doesn't depend on any existing indexes either and uses its own crawler. Would be what I'd recommend to everyone but they recently collaborated with a company that has a questionable past to create a privacy focused search engine. A company that was behind the hostile takeover of Freenode IRC.
DuckDuckGo & Co. - DDG, Swisscows and Ecosia all use Bing index. For people that only care about privacy, this is a non-issue. But I don't like the idea that the entirety of web currently depends on just two companies. So I personally don't use them. Same logic extends to Startpage, which is owned by an ad company & uses Google's results. As they rely on the Big 2, they're closer to frontends/MetaSearch engines in behavior.
Honorable mentions - Spyglass (personalized search) & Yacy (P2P search). Two non traditional search engines. I'd recommend checking out their respective Github pages for more info.
Honorable mentions - Spyglass (personalized search) & Yacy (P2P search). Two non traditional search engines. I'd recommend checking out their respective Github pages for more info.