This is a docker image for zealdocs.org.
$ docker run \
--detach=false \
-it \
--rm \
-e DISPLAY=unix$DISPLAY \
-e GDK_DPI_SCALE \
-e GDK_SCALE \
-v /etc/localtime:/etc/localtime:ro \
-v zeal_docs:/${USER} \
-v /tmp/.X11-unix:/tmp/.X11-unix \
dmitryrck/zeal
Or using x11docker:
$ x11docker -m dmitryrck/zeal zeal