Depends on what level of interaction with the website you're thinking about. If you already have a list of some proxies (not hard to get a hold of), then you could code up some simplistic Python script, leveraging the Requests library (
[Only registered and activated users can see links. Click Here To Register...]) to generate some traffic. A level higher, I'd go with Scrapy, which lets you easily parse the site's layout, allowing for better control over the generated traffic. Eg. you could easily find the newest 3 blog entries, and generate some traffic to these blog entries only.
And then there are things like Selenium for special cases.