4).http://twitr.org/
This is also one of the best twitter directory. Here you need to get authorize twitter your account for listing your keyword in twitr by clicking “Add yourself”
5).http://twtbiz.com 
we can use our twitter user name in the search bar and give search directly all our details will be listed below in twtbiz and get a link .Or We can add a business to our directory by using twitter account by clicking button “Add a business “At the top of the page
6).http://www.twellow.com 
Register with your twitter account .It’s a twitter yellow pages .We can see a icon “Get listed” in the right top of the page click that to add your twitter profile to twellow.
7). http://www.twibs.com/
First register here with your twitter Account.While registration give 4 suitable keywords. Give official mail id, blog if you have then click finish to complete registration . Your twitter account will get display under that 4 keywords in that directory.
8). http://www.tweetfind.com/
It is live twitter directory . Here we can submit our twitter for free. When click “Submit your Twitter for Free” will get steps to submit your twitter.
10). http://www.whoshouldifollow.com
Here we can find new friends .It’s giving Suggestions on interesting people to follow. Here we can able to follow more people .
11). http://tweetworks.com/
Use Twitter account to login tweetworks and here you can conversate with existing members .You can build your own group and you can join in the existing groups.
12). http://www.twollow.com/ 
We can use this for follow people based on keywords .We can Track what people are saying about your website or products.
13). http://twittermass.com 
It is another one interesting directory.We can use our twitter account to login twittemass.TwitterMass gives you all the tools you need to share, grow and inspire your Twitter Network. If you're looking to reach existing or new customers we give you the tools to spark conversation and manage your reputation.
14). http://www.tweepular.com 
It’s another one friendship management community. Here you can do bulk follow or you can follow the existing members.
15). http://www.tweepler.com 
This will show you detailed information like Avg Tweets, Total Tweets, Number of Followers,Number Following, and the Followers to Following Ratio.
16). http://mrtweet.net/ 
It will help you to discover great friends relevant to your objectives.
17). http://www.twittangle.com/
Find the friend you want to rate, tag or add to a group.
18). http://twitterel.com/ 
Login with your Twitter account and start searching friends based on your key words ,give some key words based on your own interests.
19).http://tweetree.com 
Tweetree drives your Twitter account in a tree so you can see the posts people are replying to in context.
20). http://twittley.com 
Twittley is first Twitter social website made for people to discover and share content through Twitter network