Thanks to open-source, One can have practically everything for free in a computer. Although some advises against this because of possible viruses and spywares, you just have to look for a trusted source while sticking to your firewalls and anti-viruses to ensure you have a good program. In my opinion, open-source (free) frameworks are one of the best ways to revolutionize web and applications development. Think about it: there are thousands or even millions of developers in the world and only a handful of them could actually have their hands on licensed frameworks. Without the open-source frameworks, they cannot possibly build better application and would have to stick to very traditional programs. Consumers will also have to wait and pay for things they might not use at all.