You can use a combination of open source projects. For example, you can use an OPML parser library like Listparser[0] to get the contents of the pages.

Then, you can index them into a search engine of sorts. You can use Elasticsearch[1] for that, or if you want to try something that's much simpler that I have been working on, try Typesense[2].

Finally, you can use Flask[3] to create a simple website/frontend for integrating with the search engine.

[0]: https://github.com/kurtmckee/listparser [1]: https://www.elastic.co/ [2]: https://typesense.org/ [3]: http://flask.pocoo.org/