In this venue I don't think it is necessary to talk about the advantages of open source in science. So let me add another one: it is incredibly easy to set up an almost free volunteer computing infrastructure which you can then use for crowdsourced experiments. In fact, SETI@home, the quintessentially crowdsourcing environment, has been released as the libre BOINC platform; but nowadays, with just a few lines of code and a plain vanilla server, you can create your own volunteer (or not-so) computing environment. In this talk we will explain how to set up a browser-based volunteer computing platform using NoSQL servers and what are the advantages of doing so (including a boost to your H number).