Twitter Auto DM

What is the best free software to auto DM welcome messages to new followers. I dont want to include their link at the end like ( sent from unfollow.me)

It's very rare you can find a good piece of software to do this, I spent months trying to find a good yet cheap solution just for a DM. In the end, I settled for using Statusbrew/Unfollowers and pay a certain fee a month.