browserling - Live interactive cross-browser testing from your browser.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Browsershots - Browsershots makes screenshots of your web design in different browsers.
Guitar Pro 7 - Create, play and share your tabs