GKrellM is described as «single process stack of system monitors which supports applying themes to match its appearance to your window manager, Gtk, or any other theme» and is a system information utility in the os & utilities category. There are more than 10 alternatives to GKrellM for a variety of platforms, including Mac, Windows, Android, Linux and Android Tablet. The best alternative is Rainmeter, which is both free and Open Source. Other great apps like GKrellM are Conky, XWidget, MenuMeters for El Capitan and BitBar.GKrellM alternatives are mainly System Information Utilities but may also be Desktop Customization Tools or Network Monitors. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of GKrellM.