Apps to Watermark images

GIMP (GNU Image Manipulation Program) is a powerful, free, and open-source raster graphics editor used for image manipulation, retouching, composition, and authoring. It supports a vast array of file formats and provides sophisticated tools comparable to commercial alternatives, making it a versatile choice for photographers, designers, and artists.

Phatch is a powerful yet user-friendly batch image processor that simplifies repetitive image editing tasks. Its intuitive drag-and-drop interface and extensive action library make it ideal for photographers, web designers, and anyone needing to process large volumes of images efficiently.

GNU MediaGoblin is a free and decentralized web platform designed for hosting and sharing various forms of digital media. It empowers users to create their own media hosting instances, fostering a distributed and censorship-resistant network for images, videos, audio, and more. Emphasizing user control and open standards, it provides a community-driven alternative to centralized media platforms.

Darktable is a powerful, open-source and free photography workflow application and raw developer, offering professional-grade tools for managing and editing digital negatives. It's a non-destructive editor designed by photographers for photographers.

digiKam is a powerful, free, and open-source professional photo management application designed to handle large collections of digital photographs. It provides a comprehensive set of tools for organizing, tagging, editing, and publishing high-quality images across various platforms.

Avidemux is a powerful yet user-friendly open-source video editor designed for straightforward video processing tasks. It excels at cutting, filtering, and encoding a wide variety of video formats, making it an excellent choice for quick edits and conversions.

Photivo is a free and open-source photo processor designed for advanced users. It supports a wide range of RAW and bitmap file formats, offering sophisticated tools for image processing, editing, and conversion.