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Bootstrap Studio. There is a one-time charge. Their studio works on mac, linux, and windows. You download to your machine and don't run this from the cloud.

You can host your sites wherever you want without having to use specific vendor servers.

This is very easy to use. I don't have time to spend as a full-stack web developer, when I am already busy with other things.

I'm not affiliated with the author/vendor other than having purchased their product. https://bootstrapstudio.io/

http://launchaco.com/build/

This is for landing pages but offers drag and drop simple website builder for you and I think it uses bootstrap. I use it all the time to quickly get 80 percent of what I want before refining it from there.

Take a look at webflow: http://webflow.com/