I saw the article mentions labeling tools, so I want to pitch my open-source app for labeling I built for NCSoft, it is a web-based tool similar to labelbox but has a more modern look and feel than the OSS alternatives (it gained some momentum in the Korean tech circles):<p><a href="https://github.com/slava/label-tool" rel="nofollow">https://github.com/slava/label-tool</a>