Windows: You're probably familiar with the very handy TinEye, the reverse image search engine that scours the web for similar copies of an picture. TinEye Client makes it even easier to search by letting you right-click any image in Windows to bring up similar (and hopefully larger) versions.
All you have to do is install TinEye client, right-click an image, and a TinEye option will appear in your Windows Explorer context menu. Just select it and a window will open in your default web browser with the results.
Aside from more manual upload options that the app offers — which is essentially a desktop version of what you get with the TinEye web site — that's all there is to it. We only wish you could right click images outside of Windows Explorer, such as in your web browser, but there is an extension for that.