Qtdevtools

`vagrant ssh` supports X11 forwarding according to https://docs.vagrantup.com/v2/vagrantfile/ssh_settings.html - set `config.ssh.forward_x11`  to `true` or `false` (the default). This might be better for folks who want to mouse around in their host env, but at the cost of installing an X server on Macs (XQuartz) and Windows.