> For example file syncing has no mention of syncthing and recommends something I’ve never heard of.

It does mention Syncthing.

From the site:

> File Storage & Sync

> Prefer

> EteSync

> Encrypted calendar, contacts and tasks sync.

> Syncthing

> Direct file sync between devices.

The site hasn't been updated since 2021-08-02 per the footer, and probably sparsely before that. I think this site was most popular around when Snowden did the leaks and hasn't had as much hype since then.

A more modern alternative is https://www.privacytools.io/ but I haven't checked it in a while and can't vouch for the current contents.