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A fast, feature-rich TUI system monitor written in C++23

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Features

• CPU — full-width braille history graph, per-core meters, temperature, frequency, load average
• GPU — usage %, VRAM used/total, temperature (NVIDIA + AMD)
• Memory — Total / Used / Available / Cached / Free / Swap with disk usage bars
• Network — download and upload braille graphs with live speed and totals
• Processes — Pid, Program, Command, Threads, User, MemB, Cpu% — sortable, filterable, tree view
• Themes — Gruvbox (default), Nord, Dracula, Tokyo Night, One Dark
• Responsive — adapts to any terminal size ≥ 80×24
• Zero dependencies — only libc and Linux kernel interfaces (/proc, /sys)

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Requirements

Compiler	GCC ≥ 13 or Clang ≥ 16 (C++23)
OS	Linux (kernel ≥ 3.0)
Terminal	UTF-8, 256-color or true-color

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Build & Run

git clone https://github.com/0xtooda/sysmon.git
cd sysmon
make
./sysmon

Or with CMake:

cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build -j$(nproc)
./build/sysmon

Install system-wide:

sudo make install
sysmon

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Keybindings

Key	Action
q / Ctrl-C	Quit
j / ↓	Next process
k / ↑	Previous process
r	Reverse sort
t	Toggle tree view
f	Filter processes
Esc	Clear filter
+ / -	Adjust update interval
F5	Force redraw

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Themes

Drop any .theme file into ~/.config/sysmon/themes/ and set color_theme in ~/.config/sysmon/sysmon.conf.

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Project Structure

sysmon/
├── src/
│   ├── linux/         Linux platform code
│   └── *.cpp          Core modules
├── include/           Header files
├── themes/            Color themes
├── Makefile
└── CMakeLists.txt

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License

Apache-2.0 © 2026 0xtooda