I'm playing with Twisted (a P2P twitter clone). It's a very cool idea, but it's slow to download the initial block chain (tweets are text!)
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An ad hoc, informally-specified, bug-ridden, slow implementation of half of a text adventure game -- or as I like to call it, a compiler.
One advantage I've come to appreciate about Dash/Zeal docsets: it's really nice having focused search.
The text search is constrained to the languages I care about enough to download the docset, substantially increasing the relevance. In Google I'd need to specify the language.
Learning software development through playing and contributing to a MUD: https://tashian.com/articles/how-i-learned-to-program/