Furry Technologists

Off the top of my head, I can think of Lumenier and Lynxmotion. They're kits but the electronics are plug-and-play (well, solder-and-play in the case of Lumenier, but just for the power connections). They vastly outperform DJI's drones due to their lightweight construction, and are vastly more configurable as they're designed to use off-the-shelf hobby parts as opposed to DJI's completely proprietary designs.

BLADE used to make a direct competitor to the DJI Phantom series in the form of the Chroma. Unfortunately they've completely left the multirotor market simply because DJI was able to build more market share via big-box stores vs BLADE only selling through specialty retailers, even though the Chroma was superior to the Phantom in performance and feature set.