Download of AptanaStudio 3.5 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application relates to Developer Tools. 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. This Mac app is an intellectual property of The Eclipse Foundation.
From the developer:
Build web applications quickly and easily using the industry’s leading web application IDE. Aptana Studio harnesses the flexibility of Eclipse and focuses it into a powerful web development engine.
You may want to check out more Mac applications, such as Sequel Pro, TeXworks or RStudio, which might be related to AptanaStudio.