Fastpour is an unofficial reimplementation of Teardown that runs in the browser. It is limited in scope to 2D/UI and will never be able to play levels. It is currently in extremely early stages and not capable of very much.
This software is provided to you without any warranty, i.e. it's not my problem if it doesn't work for you. While some effort has been made to make the software secure and accurate to the original, I make no guarantee that it actually is secure or accurate.
Fastpour itself is free software and can be redistributed and modified under the terms of the GNU General Public License version 3 only. Its license terms are in LICENSE. You may not use this software except as permitted by its license. If you borrow any part of this program however small and put it into a program of yours, for any person who receives a copy of your program, you are legally obligated to provide that person a complete copy of your program's source code and license it to them under the same or compatible terms.
fengari-web.js is provided by fengari-web (part of Fengari) and is used under the MIT License. Its license terms are in LICENSE_fengari-web.