Twitter tools that can make your life easier

I have done some research this weekend about software tools that enables one to get more linkages. I am surprised how many there are. Let's add a few in this discussion that you use in your Twitter activities. A site that has a good collection is : JustTweetit.com that has lot's of these tools that one can test out. Other interesting sites that I found out are:

Software that gets you more followers : Hummingbird software

The Twitter Traffic Machine...

TwitterCounter to track your traffic