I do kinda keep it up to date, but I thought I'd note a few more enhancements than usual:
The View tab has all the TV controls in it now, so you can mess with the "hue" online too.
The File tab lets you create new DMKs (+) or save out disks now.
And for those that roll their own, the need for ROM "stub files" has been lifted so long as you use the canonical filename for each ROM.
https://www.6809.org.uk/xroar/online/