
Luisa M. answered 02/10/20
ONLINE training in Italian and Japanese
I'd say the most common one is "allora" (well, then).
Apart from the ones you already listed, you have
- beh" (well)
- uhm/ehm/mmm (same as English)
- ecco... (here's the thing...)
- senti (listen...)
These are the ones I can think of in standard Italian. There are many variations and alternatives that are only heard in certain areas (deriving from regional slang, regional language, or dialect).