Yep
Neeva
You.com
Google
My 90's TV
DuckDuckGo
Getpage
Ecosia
Qiqqa
Mendeley
Zotero
JabRef
Citavi
Docear
Paperpile
BibDesk
Qiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
Based on our record, Yep seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I really hope a competitor can knock them out but it's probably wishful thinking. This new search engine shows some promise https://yep.com/ but I have no idea how they could get people to switch. Source: 11 months ago
Ahrefs is mostly SEO but has a search engine at https://yep.com. - Source: Hacker News / about 1 year ago
Neeva - Ad-free, private search
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
You.com - You.com, the world's first open search engine platform that summarizes the web for users, with superior privacy choices, actionable results, extensible apps and personalization through preferred sources.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Google - Google Search, also referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most used search engine on the World Wide Web
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .