Codeforces is a huge website with a wealth of well-defined programming problems: https://codeforces.com/help#q1
(Useful for program synthesis and other situations where you want a large problem set to play with.)
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GIMP is huge tool that I certainly haven't mastered, but it's so useful to have around.
I used it this week to convert images from obscure formats to common ones. It's a great swiss army knife and runs everywhere.
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I've been playing with labels on my code blocks. Sometimes I have useful labels, other times it's just "Example 2".
It's also unclear exactly where I put the label: Inside the box? Outside?
Are there any docs sites that do this really well?
It's a small thing, but I'm much happier with --version in the latest version of difftastic.
It shows the release number and the commit date. This gives you a reproducible build with age info.
It also shows OS, arch and compiler, because those are useful in bug reports.
