GKrellM

GKrellM is a compact stack of system monitors that brings resource, mailbox, and optional hardware readings together in one place. It suits people who want configurable desktop monitoring, especially on Linux and other Unix-like systems. Its breadth and remote-monitoring support are appealing, but GTK requirements and hardware-dependent sensor support narrow the fit.

Overview

GKrellM combines monitors in a single process and supports themes that match a window manager, GTK, or another theme. That makes it a practical choice for people who want a consolidated desktop display rather than separate utilities. Its range extends beyond system load to mailboxes, calendar widgets, and optional sensor readings.

There is a meaningful setup trade-off: GKrellM requires GTK, GDK, and GLib. The companion gkrellmd server needs only GLib and can run without GTK or X libraries, which is useful when collecting data from a remote machine without a graphical environment.

Key features

System and hardware monitoring

Built-in monitors cover CPU, processes, disks, network interfaces, memory, swap, filesystems, uptime, and internet connections. This breadth makes GKrellM useful for keeping an eye on both resource use and connectivity in one stack. Temperature, fan, and voltage monitors can raise configurable warnings and alarms, but they work only when the system hardware and software support them.

Mail and remote data

The mailbox monitor supports mbox, maildir, MH, POP3, and IMAP, and can launch a mail reader or mail-checking program. That is a useful addition for users who want mailbox status alongside system metrics, though it is not a substitute for a full mail client.

In client mode, GKrellM collects data from a gkrellmd server on another machine. Both the desktop program and server support plugins, allowing specialized monitors to be added. Remote collection and extensibility make the software more adaptable than a fixed set of desktop gauges.

Pricing

GKrellM is free: the GKrellM plan costs nothing and is released under the GNU General Public License. There is no paid tier to weigh against a restricted free edition; the same free offering is the option for anyone considering it.

Platforms

Builds or compilation options are provided for Linux, FreeBSD, Mac OS X, NetBSD, OpenBSD, and Windows. The supported-platform listing also includes macOS, Linux, and Windows. Since GTK, GDK, and GLib are required for GKrellM, those dependencies are worth checking for the environment where it will run.

Who it's for

GKrellM is a strong fit for desktop users who want a broad set of system indicators, mailbox checks, and optional sensor alarms in a themeable stack. It is particularly compelling for people who value remote monitoring or want to extend the display with plugins. It is less suitable for someone seeking a lightweight monitor without GTK-related dependencies, or who expects temperature, fan, and voltage readings to work regardless of hardware support.

Pros and cons

• Pros: CPU, process, storage, network, memory, filesystem, uptime, and internet monitors bring many routine checks into one display.
• Pros: Mailbox support spans local formats and POP3 and IMAP, with the option to launch a reader or checker.
• Pros: Client mode, a GTK-free server option, and plugins support remote collection and specialized monitoring.
• Cons: The desktop application requires GTK, GDK, and GLib, which may be an obstacle in environments without those libraries.
• Cons: Sensor monitoring depends on compatible hardware and software, so configurable alarms do not guarantee readings on every machine.

Alternatives

For a wider desktop-widget directory, browse Desktop Widget Software.

• Mango Mirror is worth considering for someone who wants clock, news, weather, background images, quotes, and custom layouts across Android, iOS, Linux, web, and Windows. Its free plan includes two screen licenses; Pro is $5.99 per mon.
• Nexus is another free option, with support across Android, iOS, Linux, macOS, web, and Windows.
• SAWAS Dashboard may suit users seeking a free dashboard for Android, iOS, web, or Windows; its free plan is for private and commercial use, with no ads or subscription.
• Duckboard is a macOS and Windows option for dashboard users. Its free plan allows one dashboard and up to three widgets; a one-time 29.00 USD Extended upgrade removes the widget limit for one dashboard.
• ClocX is a free Windows choice specifically for an analog desktop clock.
• Delta Widgets is a free, open-source option for Windows 10 and 11.
• Eww is a free, MIT-licensed standalone widget system for Linux.
• GadgetPack (formerly 8GadgetPack) is a free Windows 10/11 option; it is a 23MB download and requires administrative rights.

Verdict

Choose GKrellM if you want a free, extensible desktop monitor that combines system metrics, mailbox checks, optional sensor alarms, and remote data collection. Its breadth is the main reason to pick it; look elsewhere if GTK-related dependencies are unwelcome or your priority is a different kind of desktop widget.