Chorus is the first YAML editor that aims at providing a pleasant experience while quickly and easily configuring the plugins your Minecraft server needs, thanks to an endless amount of features.

In order to configure your remote server, head to settings and, in either SFTP or FTP, follow the instructions given. After you have configured your server, access to the server from File > Open from SFTP/FTP. You can configure how many servers you want.

Yes, since version 1.3 Chorus supports custom JavaScript add-ons via a very simple API. If you are interested, see here.

Yes, Chorus does support custom themes. If you want to create your own, see this.

Right click on any .YML file, select Open with > Choose another app. Mark 'Always use this app to open .yml files' and select Chorus. If it doesn't appear, click 'More apps' and select Chorus' .exe file after clicking 'Look for another app on this PC'

Chorus will not harm your PC in any way. The whole source code is online and you can check it yourself.
This alert is a thing since I can't currently afford a digital signature, so antiviruses will tell you the program you are about to use comes from an unverified source.

By donating any amount to the developer through PayPal your name or nickname will be added to a list that everyone can see.