The 1.26 version of QuickCast 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.
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 latest version of QuickCast can be installed on Mac OS X 10.8 or later. The program lies within Design & Photo Tools, more precisely Screen Capture. The most popular version among the application users is 1.2. The actual developer of this free software for Mac is Pete Nelson, Neil Kinnish, and Dom Murphy.
From the developer:
QuickCast is a program that lets you record screen activity to publish and share.
Once you're happy with your QuickCast, you'll be prompted to publish & share – it's super easy and every QuickCast benefits from it's own unique URL and embed code to use on your own site.
Your published links are easily accessible from the QuickCast status bar icon.
You may want to check out more Mac applications, such as Gyazo: Instant Screen-Grabbing, Screeny or Clarify, which might be related to QuickCast.