Yandex.Images - search for images on the internet, search by image
App Lock and Gallery Vault - Wish you could simply lock all your private apps on your smartphone with just a click?
lingvist.info - News & Books
AppLock (FOSS) - A privacy App lock FOSS application.
Image Search Options - Download Image Search Options for Firefox. Image Search Options provides a set of highly customizable reverse image search context menu options.
Hide Secrets - Hide Secrets is an app that allows hiding everything they deem confidential on their smartphone.