Downloading Additioner 1.1 for Mac from our website was free. The program is included in Developer Tools. The actual developer of this free software for Mac is Stuart B. Russell.
From the developer:
Additioner is a free utility to manage your scripting additions on Mac OS X. The Additioner enables you to browse, install and remove your Mac OS X scripting additions. It is especially useful when you need to switch between multiple versions of the same scripting addition without deleting any of the versions.
You may want to check out more Mac applications, such as Witango 6, WitangoStudio or MySQLman, which might be related to Additioner.