I am a bit confused. You say you are currently working in Rails, which is an open source framework built on top of an open source language. What database are y

I am a bit confused. You say you are currently working in Rails, which is an open source framework built on top of an open source language. What database are you using? PostgreSQL (open source), MySQL (potentially open source), MongoDB (open source), or something else? In my experience all of my Rails apps have been built on an open source database, though I know it is possible to use a proprietary one. What web server are you using? Nginx (open source), Apache (open source), something else? I am absolutely sure you could run Rails on a non-open source web server, but I find that rather unlikely. What OS are you using? This might be where you are not open source. But in production I would imagine the majority of Rails apps are deployed on a Linux/BSD platform... which are open source. So I guess the question is, what is your stack?