The theme for Synthetica called "BlackEye" looks compelling.
(from http://www.javasoft.de/synthetica/themes/) There is also a WebStart demo available (works smoothly on Mac). Synthetica is distributed under a commercial license, but is free for non-commercial applications.
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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