RAM Charger 8.1 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. The application lies within System Tools, more precisely System Optimization.
From the developer:
RAM Charger breaks down inefficient memory partitions so that memory can be allocated where it's really needed. With it, you can avoid running out of memory while working in multiple applications. RAM Charger is completely compatible with Virtual Memory and RAM-doubling software.
You may want to check out more software for Mac, such as Make RAM Disk, Clean Memory Master 2016 - Clear & Free RAM Optimizer or Memory Booster - RAM Optimizer, which might be related to RAM Charger.
System Optimization
Battery Utilities