each extension developer is responsible to provide their extensions for the public
as the Appybuilder community is closed and the extension has not been published elsewhere, it looks like it is lost...
however for @Ken we can make an exception as we already did with the tableview extension...
so if someone stored the TextboxTools extension by @Ken, feel free to upload it into this thread
Thank you
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.