To install the programs I suggested on macOS, you can use Homebrew (also known as brew). Homebrew is a popular package manager for macOS that allows you to easily install and manage software packages from the command line.

Here are the steps to install Homebrew and use it to install the programs I suggested:

1. Install Homebrew by opening Terminal and running the following command:

   `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`

2. Once Homebrew is installed, you can use it to install the programs I suggested. For example, to install ImageMagick, run the following command:

   `brew install imagemagick`

3. To install Potrace, run the following command:

   `brew install potrace`

4. To install Inkscape, run the following command:

   `brew install inkscape`

As for which program is the best, it really depends on your specific needs and preferences. Inkscape is a full-featured vector graphics editor, while Potrace is a command-line tool that is specifically designed for vectorizing bitmap images. ImageMagick is a powerful image manipulation tool that includes a wide range of features, including the ability to convert images between formats and perform basic vectorization.

If you have confidential information that you do not want to upload to an online vectorizer, then using a local tool like Potrace or ImageMagick may be a better option. However, it's important to keep in mind that any tool that runs on your computer may have access to your data, so you should always use caution and take appropriate security measures to protect your confidential information.
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