This website is meant to help jugglers communicate over the web. To create a gif of your own, simply choose the siteswap you want and type http://siteswapbot.com/your_siteswap into the url bar. If it takes a few seconds, don't worry, this means you're the first to generate that siteswap on this site!
Don't know what a siteswap is? A siteswap is a mathematical notation by which one can represent juggling patterns. There are lots of rules, but this site can serve as a nifty learning tool for those interested.