Monitoring
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Life-changing tool allowing you to block IP addresses based on their logged suspicious activity.
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Powereful tools allowing you to collect and display any metric you want, about anything.
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Very easy to use facility allowing to keep /etc in a git repository.
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A very basic python script I wrote out of boredom in uni. Draws a graph of processor, memory and storage useage (badly) mimicking the Windows Task Manager's "Performance" tab.