Download of AS2Shell 1.2.0 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.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The application lies within Developer Tools, more precisely General. The actual developer of this free Mac application is ATLief.
From the developer:
AS2Shell is a light-weight tool that converts AppleScript source code into a single line of bash code in real time. Additionally, the code can be read from any AppleScript source-code file, instead of writing or copying it manually into the writing view. This is useful for sharing or embedding AppleScript in other mediums easily, while still maintaining the powerful system and accessibility integrations that it holds in natively executed scripts.
You may want to check out more Mac applications, such as BetaBuilder for iOS Apps or Inspector Gatt, which might be related to AS2Shell.