Download of LispPad 1.6.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Developer Tools, more precisely Webmaster Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
LispPad is a simple, lightweight, integrated development environment for developing and running Scheme code on macOS and iOS. The language supported by LispPad is based on the R7RS standard of the Scheme programming language.
You may want to check out more software for Mac, such as Url Extractor X, WebPics or Browsealoud, which might be related to LispPad.