Hey there, I'm glad to present Vox Uristi, a tool to export fortresses in the .vox voxels format. This can be used to make renders of fortresses, such as the one pictured: Heavenfall by Horrigant. You need to have DFHack installed to use it, and the rendering is done by MagicaVoxel.
Check out the gallery for more renders.
I've been using it to look at my fortresses, its a great tool!