There are tons of brilliant open-source apps. You'll find open-source titles for Linux, MacOS, and Windows. Some of these apps are so good, they should have a price tag. Since I started my journey ...

GitHub hosts powerful open source apps you can use daily, from Immich for photo backups and Upscayl for image upscaling to VERT for file conversion, BC Uninstaller for cleanup, Mole for Mac storage, ...