The Ludwig editor has been open sourced! https://www.adelaide.edu.au/news/news98662.html
Ludwig was an early (38 years ago) editor offering full screen editing, which was wildly computationally expensive next to contemporary line editors.
miniblog.
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Google has open sourced their NLP parser: https://research.googleblog.com/2016/05/announcing-syntaxnet-worlds-most.html (includes some great examples of sentences that are hard for machines)
Crowd-sourced creation really benefits from letting users claim the glory. A user may show off SO rep, but there's no Wikipedia equivalent.
It's really exciting to see @droneio open sourced. Jenkins is good, but it would really benefit from competition.