App Tamer 2.4 is now available. It offers a new option to hide applications after they’ve been idle, and also lets you hide its CPU usage graph if you just want to see its lists of CPU-consuming processes. There are also fixes for several bugs, including one that could result in App Tamer not correctly slowing (or un-slowing) an app if you had the “Do not slow or stop apps if power is plugged in” option turned on.
As an additional note, App Tamer works with beta versions of Mojave, but it doesn’t yet support Dark Mode. However, you can switch App Tamer to its own dark appearance and that makes its main window match, at least.
A complete list of changes and a download link are on the App Tamer release page, or if you’re already running App Tamer, you can just choose “Check for Updates” from the menu in the lower right corner of its window.