The 1.0 version of SmoothMouse for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. 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. The software lies within System Tools, more precisely General.
From the developer:
SmoothMouse is a preference pane to control acceleration for mice and trackpads.