JShot is a useful, WebStartable "screenshot" application. It can be installed either with installer, or with WebStart. There are several look and feels available, the default one looks similar to Mac OS X. I tried, however, to switch to Nimbus. It worked without any problems. The application is really responsive and comes with nice features (like FTP upload).
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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