NXTBridge Offline is a HTML page (with JS).

It can be opened in any browser. Source code:

https://bitbucket.org/scor2k/nxtbridge-offline/src

SHA-256:

c44daefa8758d0d0ff26ef39ae0cea27f7e9fa7a7a780736749909b74f158c7b

Do verify the SHA256 – to make sure you are not using a malicious program.

Software license: GPLv2 or later. License URI: http://www.gnu.org/licenses/gpl-2.0.html.