ZPL-Viewer emulates a Jet-Direct port on your desktop, and renders incoming printer data directly on the screen. As backend, it uses labelary.com´s online REST-Api, which is currently free (fair use).

Supports versions 1.8.8, 1.9.4, 1.10.2, 1.11.2, 1.12.2, 1.13.2, 1.14.4, 1.15.2, 1.16.1, 1.16.4, 1.17.1, 1.18.1, 1.19, 1.20.1, 1.21.1, 1.21.4.