Open source has a lot of advantages. For starters, the license is free, which means you take a huge part of the expense out of the equation, but just because the license is free doesn't mean the entire implementation is. You still have to learn about it, set it up, possibly customize it, roll it out, train your users and so forth, just as with any enterprise software. But with open source, you have a lot greater freedom to get under the hood than you do with its proprietary counterparts and to connect to other systems or even completely rework it if you wish. That's the beauty of open source. The code is open and accessible, so you aren't locked into a proprietary vendor's view of what your software should look like.