Download of Whisk 2.6.2 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. We recommend checking the downloaded files with any free antivirus. This Mac application is a product of Tumult Inc. The application lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
Whisk is a lightweight HTML and PHP editor with a live preview pane that displays the updated page as you type. The tool’s integrated live preview breaks the tedious cycle of writing HTML, saving the file, then reloading and viewing the page in the browser. Combining the writing phase with the viewing phase clarifies the effects of your changes and speeds up the overall process of making a web page.
You may want to check out more Mac applications, such as Mirror Mysteries, Spout or Image Dream, which might be similar to Whisk.