You can download Sign Tool 1.0 for Mac from our application library for free. The actual developer of this free software for Mac is The Synapse Project. Sign Tool for Mac lies within System Tools, more precisely File Managers.
From the developer:
Sign Tool makes signing your file for Appast super easy. Just launch the app, drag and drop your file and private key then sign it with just a single click.
You may want to check out more software for Mac, such as Tools for Television PRO, Make My App - Mockup Tools for Developers or Smart Screen Tool - Capture Video, which might be similar to Sign Tool.