Ask HN: What's the best Search+Filtering reusable UX component out there?

I really like how AngelList (https://angel.co/jobs) and F6S (https://www.f6s.com/jobs) allow you to search for startups/jobs. The fact that you can select a filter and then it gets displayed as a tag inside the search box.

I'd like to have that kind of control for searching hotels for the project that I'm working on, and can't stop thinking where is that Search+Filtering control used from, since both AngelList and F6S use it.

Does anybody know what Search+Filtering control AngelList and F6S use? Also, is there even a better alternative to that control for searching in a list of items, while allowing users to filter based on different things? I've looked at Semantic and Bootstrap and nothing even comes close.

Thanks a lot!