The earlier versions of this repo still used the Trello logo. Trello's CSS is blatantly used, even using trellicons, the custom icon font created by Trello. The entire front-end is completely, blatantly stolen.
If you want to build LibreOffice as a free alternative to Microsoft Word, that's great. But taking Microsoft Word's code and uploading it into an open source GitHub repository? That crosses the line. I don't care what legal ramifications there are or what constitutes copyright infringement or what is legally actionable (heaven knows the law is often off base from what is right/moral/ethical, especially in software). That's another discussion, but this is messed up.
Can you create a task management system in Meteor.js that is inspired by "agile" methodology and similar to Trello? Sure. But blatantly taking code, especially without even putting a creative spin of your own on it, is just plain wrong.