Something similar to twiends is buzzom.com; you can search and follow by keywords and phrases, but like vinith98 said in many cases they are low quality.
I also want to make my twitter account increase it followers... is there other way aside from what you had given above?
what you had said is one of the things that I am currently doing on twitter now.. it is kinda effective but not efficient.. but it's okay
Try to improve your tweet.Every tweets create your image so consider your every tweet.tweet use not only for get traffic but it use in proper way.so get defiantly good followers.
To increase any followers, you need to be putting on valuable content on a consistent basis and not spam. Don't worry about the quick bit, your fan base or followers will increase when you focus on providing solutions to the people who are with problem. Tweet often, tweet consistently, tweet funny, tweet timely, tweet engagingly
Did you check out Twiends? Works really great for me. Free stuff. Also http://www.getmorefollowers.biz sells an efficient method for just $5.