The nText text creation app is powered by web technologies including the ExpressJS server, the AngularJS framework and the NeDB database.
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Once you download the file, unzip it and then drag the ntext.app file (which you will find inside the unzipped ntext-app directory) to your applications directory. In order to run it the first time you may have to control-click the ntext.app in your applications folder and give permission for it to run.