What are the preferred tools to send cold emails from Gmail? Not too many, just about 200 per day.

Gmass

warm up some domains first and also ensure that you have somthing like outreach

If the list is subscribed list MailChimp is best

I use Saleshandy. They also have email warmup feature and show real-time credibility of your domain/address in terms of email deliverability, I have been using them for a long time. DM me if you need more help with this tool and in general with your email reach out efforts.