Looks like the VMoo website is still there but is having... issues. But this is the last release. If you have a high DPI display you may find it slightly lacking, even with Windows compatibility settings applied. Which is a shame because VMoo was always the best client.

Most GUI-users use Mudlet (https://www.mudlet.org/) these days. Unfortunately, as far as I know, it lacks proper local editing support. If you're feeling adventurous you can work around that with something like MUDMixer (https://github.com/tms88/mudmixer) to proxy local editing.