A convenient calculator for total bytes written. In short, it is calculated by multiplying Total_LBAs_Written with the sector size (512B or 4KB). Both info can be retrieved using smartctl.

~# smartctl /dev/ada0 --all |grep "Sector Size"
Sector Size: 512 bytes logical/physical
~# smartctl /dev/ada0 --all | grep Total_LBAs_Written
241 Total_LBAs_Written 0x0032 099 099 000 Old_age Always - 25351376107

converting and comparing image formats

A free usenet search engine.

Set a function, draw on the z plane and watch the mapping out on the w plane.

Given a height, a location, a time, this tool can be used help find the direction and length of the shadow.

Very useful in spotting out the location/time/height photo by backward inference.

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very good for playing around with different languages

<blockquote>A modern commutative diagram editor with support for tikz-cd.</blockquote>

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Easily bypass the restrictions by manually editting a local storage entry.<blockquote>

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<blockquote>Measure latency to Google Compute Engine regions</blockquote>