Übersicht vs GKrellM

Übersicht is a free macOS app that places the output of system commands on the desktop in small widgets. Widgets can present information as tables, charts, or graphs, adapt to screen sizes, and are written in HTML5, JavaScript, and React JSX. The app includes a gallery and installation instructions for community widgets, spanning categories such as system monitoring, clocks, calendars, weather, RSS feeds, networking, and media. For development, Übersicht watches the widget directory and updates the display when files change. Commands run at a configurable interval, once per second by default, or can be set not to refresh automatically. A built-in local proxy supports Ajax requests to external sites, and AppleScript scripting is available. The download page specifies macOS 12 or later, and the app is released under the GNU General Public License version 3 or a later version at the user's option. Widgets can execute arbitrary code, so the maker advises checking their source; malicious code cannot be ruled out.

GKrellM is a free system-monitoring program that stacks multiple readings in one interface and supports themes matching a window manager, GTK or another theme. Its built-in monitors cover CPU, processes, disks, network interfaces, memory, swap, filesystems, uptime and internet connections. When supported by the system’s hardware and software, temperature, fan and voltage monitors can show configurable warnings and alarms. A mailbox monitor checks mbox, maildir, MH, POP3 and IMAP mailboxes, and can launch a mail reader or mail-checking program. GKrellM can also run as a client and collect data from a gkrellmd server on a remote machine. Both the program and server support plugins for specialized monitors. Builds or compilation options are listed for Linux, FreeBSD, Mac OS X, NetBSD, OpenBSD and Windows. GKrellM requires GTK, GDK and GLib; the server requires GLib and can be installed without GTK or X libraries. It is released under the GNU General Public License at no cost.