My main wish is a way to search the repositories on a node. Or a way to have tags. The whole network is like a blackbox of projects unless you can get an outside link.

If the node runs an HTTP API (radicle-httpd) backed by an indexer (radicle-search), you can.

Try https://radicle.network/explore and set index.radicle.garden as your search seed.

https://stats.radicle.at/repos

Thanks this is exactly what I was needing.