This is a source code for the old Journalite app from 2014. Archived and unsupported.
Released under the MIT license, so if you want to continue developing it, feel free to fork this repo. However please don't use the "Journalite" name (but you can use the original artwork and icons.)
It's written in Angular.js which runs on top of node-webkit, so it's cross-platform and ran on Windows, Linux, and macOS.
Updater uses DSA signatures, but obviously, I removed the original private key, Generate it yourself (as sign/update_dsa_priv.pem, sign/update_dsa_pub.pem) and don't forget to update app/package.json.
I don't remember how to build it. Check Gruntfile.