domain search

Hello, dear community! Where can I find a list of taken domain names? The thing is that I'd like to research my competitors by keywords, which consist of the domain name, and take a look at these domains as a result :') Thank you and have a nice day.

I need to contact domains that contain certain keyword. Once I get those domains, if they meet my criteria, I wish to offer them my products and services via email. For example, domains that contain city name. Let's say Boston. What is the best way to find these types of domains?

Just did a quick domain name search on the .today TLD extension. I took the most commonly registered (.com) keywords on the internet (9,171 of them) between 3 and 13 characters long and ran a domain name search. Of that, 4,393 domain names are still available to regisiter (as of 11Mar14)...