NixieStats 3.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. 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. This free software for Mac OS X is a product of Takuto Nakamura.
From the developer:
NixieStats is a Nixie style activity indicator for your Mac. With this application, you can check the CPU usage, memory performance, and disk capacity with ease. The information is visible in the menu bar at a glance. This way, you can monitor your system at any moment.