Hello there, thank you for your support! I render and animate everything in UE4 yes, appart for those screenshots, they are directly rendered in Magicavoxel. the gif animation was done in a very cool software called screentogif. With this you can record your screen and make a gif out of it, it's also possible to edit the images etc.
For game dev production I usually make my models in magica, I export them into an OBJ, I optimize them in 3ds max if needed (characters need it), then I rig them, usually with an auto rig such as mixamo. And I'm off to import it in UE4 :)
Hope you find it useful. Don't hesitate asking me questions if you need and to show me your voxel art, @mask974 is my twitter.