I'm often surprised by the effectiveness of a good README. It brings huge clarity and steers development. It may be GitHub's best feature.
miniblog.
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A charming text editor UI where you can doodle line drawings alongside text: https://akkartik.name/lines.html
This shows the effectiveness of doing a small number of things in the interface.
On the engineering effectiveness of shared internal communications, rather than siloed emails.
https://www.mattritter.me/?p=526
The effectiveness of fuzzing, the limitations of current research, your best options today, and a worked example: