I am looking for a real custom search engine for months now. I tried google programmable search engine, bing custom search and was even building scripts for duckduckgo, but nothing really worked for me.
For example, I have a list of 7500 company websites and I want to search them regularly for keywords, like product names, company names mentioned on them or if they have a some references to certain industries.
Not exactly the same but Syften (https://syften.com/) can do this kind of 'listening' for social platforms like HN, Reddit, ... . Possibly you could reach out to Michal about extending their ingest with arbitrary/custom websites?
For example, I have a list of 7500 company websites and I want to search them regularly for keywords, like product names, company names mentioned on them or if they have a some references to certain industries.
This could be a solution.