MoveAnything is one of the greatest addon in WoW, we can easily rearrange the elements of the UI with it. In WoW 10.0 we have Edit Mode now for the same purpose but it's greatly reduced in functionality compared to MA. In Edit Mode we're still unable to move most of the elements, such as loot windows, bag frame, quest detail/achievements/character/whatever panels, roll popups and so on. With MoveAnything we can set location of literally any frame we want. It also provides a toggle for Blizzard's framestack tooltip.
This decade old addon has been updated from expansion to expansion by enthusiastic community members as the original author is inactive for a very long time. However WoW 10.0 broke the addon again. I recently found a guy who already fixed the core functionality of MA and his version is more or less working in 10.0. It still has some bugs in moving frames saving positions, taints, and other lua errors but at least it's working:
(ps: I know there are Blizzmove and Drift but while those alternatives have similar functionality they do not provide the same level of customization and/or usability. Not even close. Those are rather like enhanced Edit Modes.)