Thanks! instantsearch.js is going well with more than 150 clients using it. We are getting a lot of feedback and will soon make it more compatible with React for example.
All our work is open source BUT the actual algolia engine, mostly because it does not make sense right now to open source it.
It's really great to work on everything open source on a daily basis.
Actually we released today our community website, listing most of our most important open source work: https://community.algolia.com/
Our next open source project should ve https://community.algolia.com/docsearch/, we already open sourced the js part: https://github.com/algolia/docsearch.js and we should be releasing the scraping part soon :)