Paris Charles de Gaulle (CDG): free WiFi, solid lounges.
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Yes. Free WiFi is unlimited, but CDG's layout is notoriously confusing — allow extra time to find your gate.
Lounge quality here is solid. A day pass, often purchasable without status or a premium ticket, can be well worth it for a longer layover.
Extensive duty-free shopping throughout, especially in Terminal 2E.
It depends on how long you have — check the amenity above, and otherwise treat it as a functional connection rather than a destination in itself.