Elegant Themes is the creator of Divi Builder, Divi Theme and numerous other related products. This is the WP page builder I use and I find that it’s the best I’ve tried. It does a lot of things that would require dozens of separate plugins to accomplish (and who know if they’d all work together — but by using Divi Builder/Theme, I’m sure that everything I need done, gets done).
This has my highest recommendation. I own a lifetime license to this software.