This patent is comprised of mainly open source technologies all put together. Can open source items be patent in this manner without a reference? The open source project I'm referencing is Kegbot (http://www.kegbot.org, https://github.com/Kegbot). This open source project does the exact same thing this patent specifies and has been in existence since 2010.
To the question (paraphrasing) - Can open source technology all put together be patented ?
First, anything published before the date of filing or priority date can be used to show that a potential claim is not new, or if new, is obvious. Whether the earlier publication was a journal article, a patent, a rejected patent application or an open source project is generally immaterial. The earlier technology being open sourced doesn't make it any weaker or stronger prior art than if it were proprietary technology disclosed to the same level of detail.
Second, most new things are old things put together so that, itself, does not answer the question about non-obviousness. It is taken on a case-by-case basis.