GPL-2.0-licensed tools
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atop
Linux performance monitor that tracks CPU, disk, memory, and network usage per process.
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htop
An interactive process viewer with a full-screen, colour display and mouse support.
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ls++
Colorized ls on steroids — a wrapper that lets you reorganize the order of columns.
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mtr
Network diagnostic tool that combines traceroute and ping in a single live display.
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multitail
Monitor logfiles and command output in multiple windows in a terminal, with colorizing, filtering and merging.