Whiskey Feature Switchboard is an interactive IPA chart that allows you to see the binary features of a particular phoneme, or filter the IPA chart by features.

During my first semesters studying Linguistics, I was introduced to this tool when it was hosted at https://kllwynog.github.io/elfennau/whiskey.html

Later, that page was taken down, but my colleague Sylvia Page reached out to Klaus Llwynog, the original creator of Whiskey Feature Switchboard, and he sent the source code, so we brought it back to make it accessible to future Linguistics students!

In that same email he said:

You're more than welcome to use it, modify it, share it, and so forth, so long as credit is given, the licence isn't restricted, etc... Please let me know if you have any thoughts, questions, comments, or feedback! Whiskey is kind of in 'dormant' development, where it's not in active development, but I've also not completely ruled out the idea of returning to it at some unspecified point in the future.

Here are the original acknowledgements, also found in the HTML source of the main Whiskey page:

(C) 2018 Klaus Llwynog.

This file is part of Whiskey.

Whiskey is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, (at your option) any later version.

Whiskey is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Whiskey. If not, see http://www.gnu.org/licenses/.