if you do a google search you can find a couple of them. Quatloo is one of them which i believe i read somewhere that QTL (the altcoin that you need to hold in order to be able to use the software) is being delisted! so better have that in mind.
you can also do a github search like this:
https://github.com/search?utf8=%E2%9C%93&q=poloniex+bot&type=play around with the keyword and also use the sidebar to select the programming language that you understand.
sadly i have not checked any of these thoroughly to be able to assist you any further.
but also remember most of these are small projects with not much testing so you should expect some possible bugs.
also remember to either understand the code, check it first and then use it or use something that is released by someone you trust or can find some feedback of it developer. being open source doesn't mean they are safe.
