For a free desktop app that can strip backgrounds out of photos without needing any network connection, BG Remover is a great option. The app uses AI-infused machine learning technology to strip backgrounds in a few seconds and has a simple, one-click interface with drag-and-drop convenience. It also has some basic editing controls, making it a good option for people who want to do some image processing without going online.
Another option is Snapclear, which works on Windows, Linux and macOS and offers offline background removal and image upscaling. It has flexible pricing options including a free tier, and it can handle batch jobs and lots of image formats, so you should be able to get what you need out of your image editing work without compromising your security or privacy.
PhotoScissors is another option. Although it has an online version, its Windows and Mac versions let you strip backgrounds offline, too, along with other features like batch jobs and support for lots of image formats. It's good for e-commerce, job hunting and other situations where you need to strip backgrounds fast and accurately.