This site will help you make a Twitterbot! They're easy to make and free to run.
To use it, create a Twitter account for your bot to run under and then sign in below. The bots are written in Tracery, a tool for writing generative grammars developed by Kate Compton. This site is run by George Buckenham - he can be contacted at email@example.com. You can support this site on Patreon.