G'MIC is a full-featured open-source framework for image processing, providing several different user interfaces to convert/manipulate/filter/visualize generic image datasets, ranging from 1d scalar signals to 3d+t sequences of multi-spectral volumetric images, including 2d color images.
Photoflare is a cross-platform image editor with an aim to balance between powerful features and a very friendly graphical user interface. It suits a wide variety of different tasks and users who value a more nimble workflow. Features include basic image editing capabilities, paint brushes, image filters, colour adjustments and more advanced features such as Batch image processing.
gallery-dl is a command-line program to download image-galleries and -collections from several image hosting sites. It is a cross-platform tool with many configuration options and powerful filenaming capabilities.
Ventoy is an open source tool to create bootable USB drive for ISO files. With ventoy, you don't need to format the disk over and over, you just need to copy the iso file to the USB drive and boot it. You can copy many iso files at a time and ventoy will give you a boot menu to select them. Both Legacy BIOS and UEFI are supported in the same way. 420+ ISO files are tested. A "Ventoy Compatible" concept is introduced by ventoy, which can help to support any ISO file.
NAPS2 is a document scanning application with a focus on simplicity and ease of use. Scan your documents from WIA- and TWAIN-compatible scanners, organize the pages as you like, and save them as PDF, TIFF, JPEG, PNG, and other file formats.