The repository is here: https://github.com/searxng/searx-instances and the public list: https://searx.space
Note from @unixfox:
This repository now hosts the remaining SearX instances that are working as of 9th May 2023 according to https://searx.space.
This repository is not maintained by me anymore nor by SearXNG developers, I'll give it no update. If you want any modification in this repository, please reach out to the SearX maintainers (@kvch and @asciimoo).