atop is a nice, easily installed system-level monitoring tool. It collects CPU/memory usage per process over time for later inspection.
miniblog.
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Optimise time to first feature. Allow mutation of the running system to experiment. Interactive inspection of data.
From simple IP blocks to probabilistic deep packet inspection: the evolution of web censorship technology: https://news.ycombinator.com/item?id=22659534
A snake game implemented entirely in the browser element inspection interface! https://matthewrayfield.com/goodies/inspect-this-snake/
A wonderful example of creative computing.