After many years involvement as the user of Open Source programs, I try to find out what makes people want to release the program they made as Open Source. Long time ago, I thought that was crazy because they gave their best product, which made with huge effort, for totally free. Not only that, even the source code itself is also opened so the other people can grab it, learn it, and modify it. In short thinking, I guess they are doing that purely just for fun, nothing else.