Originally Posted by
franko
I'm using Coffee Cup responsive apps (RSD, Foundation Framer, Bootstrap Builder and a few more). Foundation Framer is my choice because Foundation is a mobile first approach to coding. If you can afford it, though Responsive Site Designer is the best choice because it gives you a choice of frameworks - Foundation, Bootstrap and RSD's own framework. Ain't nothing you can't do with these apps as you have complete access to the html, css and javascript. Bit of a learning curve but well worth it.
You can also turn any site into a responsive site by adding some Bootsrap code. Freecodecamp.org has a good tutorial series on doing this. In fact, it has a whole web coding course that is completely free and I highly recommend it.