Free research tools or service for developers

BuiltWith

Web technology information profiler tool. Find out what a website is built with.

Tags: profiling, information, research

OA.mg(Open Access for Everyone)

Search for papers or authors, download and read 200 million open access research papers

Tags: search-engine, research

Similarweb

Similarweb is the ultimate competitive digital intelligence tool for a complete 360-degree view of your industry, competitors, and customers.

Tags: profiling, information, research

Wappalyzer

Find out the technology stack of any website. Create lists of websites and contacts by the technologies they use.

Tags: profiling, information, research