The 1.0 version of FontSieve 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. The software belongs to Developer Tools.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. You can install this free application on Mac OS X 10.9 or later. The most popular version of FontSieve for Mac is 1.0. The actual developer of this free software for Mac is Impathic LLC.
From the developer:
FontSieve is an app for web developers and designers that enables you to embed a compact subset of a font directly in your HTML5 web page. You can use it to create custom headlines, banners, and other static text using any TrueType or OpenType font installed on your Mac and be confident that it will load in any modern desktop and mobile browser that supports HTML5.
You may want to check out more Mac applications, such as RAGE Domainer, konqueror or Abyss Web Server, which might be similar to FontSieve.