XRG is described as 'open source system monitor for Mac OS X' and is an app in the OS & Utilities category. There are more than 10 alternatives to XRG for a variety of platforms, including Mac, Windows, PortableApps.com, Android and iPhone. The best alternative is Process Explorer, which is free. Other great apps like XRG are iStat Menus (Paid), SystemExplorer (Free), MenuMeters for El Capitan (Free, Open Source) and Stats (Free, Open Source).
- MiniUsage displays various data like CPU usage, amount of network flow, battery status and process names which uses much CPU time in a menubar. View 28 alternatives to MiniUsage
The program seems to be no longer updated. Last version, 3.0.0, released in April 2015, can be still downloaded from the official website, but it doesn’t work on macOS 10.13
- Free • Proprietary