browserling - Live interactive cross-browser testing from your browser.
Doka.Photo - Edit images without leaving your browser
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
ProductShot - Generate better performing product screenshots
Browsershots - Browsershots makes screenshots of your web design in different browsers.
Sumo Paint - Photoshop in your browser, Sumo Paint an advanced browser-based image editor.