Downloading VitalSigns 2.26 for Mac from the developer's website was possible 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. VitalSigns for Mac relates to System Tools. The actual developer of this free Mac application is creational.
From the developer:
Check system temperatures, fan speeds and RAM usage with this widget for the OSX Notification Center. Designed from scratch to provide a clean and nice-looking user interface. Fully customizable widget that shows the data you are really interested in. Use the setup application to pick the sections and system components you want to include in the widget. You can also choose your preferred units here.
You may want to check out more Mac applications, such as TransparentDock, Peek-a-Boo or DiskFire, which might be similar to VitalSigns.