jedit.org is an opensource text editor entirely written in Java. jEdit requires JDK 1.7+ and it runs on all OS platforms. In real world jEdit looks better, than the official screenshots. Java-based, as well as native installers are available for download (~ 5MiB).
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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