Gui Builder
Smal guild builder (it's a bit buggy but in good hands it can be fun)

to achieve the same effect as in the picture above, turn off boolean
free&non-slots
and set GRAY_STAINED_GLASS_PANE sltos to
PlaceholderApi don't working
If placeholders don't work, make sure you have the latest placeholderapi plugin and latest online players and downloaded the appropriate placeholders