is there any software to send automated tweets?

hi,
i need a software to send tweets every 30 minutes i don't want to schedule the tweet it is ok to send same tweet, i tried tweetdeck it is hard to schedule tweet every 30 mits it is taking too much of time, if you know any software or website please let me know.

Regards,
Naveen.R

tweetadder, or use socialoomph.