I've had good luck with Twiends as well.

Also Tweepdash is helpful for monitoring who's not following you back.

If you want to increase Twitter Followers then you have to fallow other person and share informative post.

First of all you need to create company profile page on twitter and then follow people related to your business.

You can increase your twitter follower by sharing your public profile to the user. you can take the help of facebook, Google+, tumblr, pinterest and another social networking sites.

For me manual way of increasing your twitter followers is still effective, follow people and ask them if they can follow you back.