fantastically helpful

I am lost without it.

Window management in OS X is always a bit of a trick, and its difficult to drag and drop things when theyre scattered among different windows on different Mission Control screens. Yoink fixes this issue easily and simply, by giving you someplace to set things down during your drag and drop operations. You can find the thing you want to grab, drop it in Yoinks shelf, and then click around to find a place to put it. (You can keep them there a while while you compose and collect, too)

Dragging works in and out of almost all applications Ive tried, too, and sometimes even better than youd expect. If you need to upload a photo from Photos to Craigslist, for example, you cannot drag from the application to the browser. But if you drag to Yoink first it forces Photos to do an export, and then you can drag merrily into a browser-based upload button.

BayAreaDad about Yoink - Better Drag and Drop