CleanMem is a Free/Pro program.
CleanMem itself is totally free. When you install CleanMem it will auto run every 15 min by the Windows Task Scheduler. Once installed it is set it and forget it. Just as it always has been.
You can configure CleanMem to do more advanced things such as ignore lists, only lists, and log files. These can be set by the CleanMem Settings program in the start menu.
Tools and Utilities
Product page: here