Hello Jean Denis,
I have found this UA Tracker source and I thought it may prove useful in your development!
Tracking user-agents across the web.
You can download the user agent file (Text) from here:
For those who would like to help document the diverse user agents used by bots, They also have a little script string site owners can add to help track and document user agents
<a href="http://www.ua-tracker.com" target="_blank"><img src="http://www.ua-tracker.com/image.png" alt="UA Tracker - Tracking user-agents across the web." title="UA Tracker - Tracking user-agents across the web." /></a>
All the best!