NooBox is described as 'A useful Toolbox! Reverse image search with multiple engines + Extract images + Screenshot & Search' and is a Image Search Engine in the Online Services category. There are more than 25 alternatives to NooBox for a variety of platforms, including Online / Web-based, iPhone, Android, Mac and Windows. The best alternative is TinEye. It's not free, so if you're looking for a free alternative, you could try Google Images or Google Lens. Other great apps like NooBox are SauceNAO (Free), Image Search Options (Free), Search by Image (Free, Open Source) and trace.moe (Free, Open Source).
SauceNAO is a reverse image search engine. The name 'SauceNAO' is derived from a slang form of "Need to know the source of this Now!" which has found common usage on image boards and other similar sites.
Search by Image is a Firefox extension which enables you to initiate a reverse image search from the right-click context menu or the browser toolbar, and comes with support for more than 30 search engines.