SigMaker 3 3.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The SigMaker 3 installer is commonly called SM3MacDemo.zip. This application's bundle is identified as com.fontlab.sigmaker3.
The following version: 3.0 is the most frequently downloaded one by the program users. The actual developer of this software for Mac is by FontLab Ltd. 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 program lies within System Tools, more precisely Fonts.
From the developer:
Each computer font consists of graphical characters called glyphs. With SigMaker, you can easily create glyphs on your own, from photos, drawings, scanned signatures or company logos, and add them to any of the OpenType (new in version 3) or TrueType fonts that are installed on your system, at a character slot (keyboard position) of your choice.
You may want to check out more software for Mac, such as TIffany, ASCII:edit or Fontographer, which might be similar to SigMaker 3.
Fonts