A free, non-official, 100%-online property editor for TouchOSC layout files.
Try it here:
http://justlep.github.io/quickedit4touchosc/
TouchOSC is a registered trademark of hexler.net
QuickEdit is not provided by or related to hexler.net
For more info on TouchOSC, visit their official page at https://hexler.net/docs/touchosc