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Userparser - Get user geolocation, crawler, browser, operating system, and device names using real-time, lightweight JSON response user agent parser, and ip lookup API.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
ipgeolocation.io - Free IP Geolocation API and Accurate GeoIP Lookup Location Database
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
ipinfo.io - Simple IP address information.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.