ResizePixel is a free online image editor where simplicity is essential feature. It is designed to crop, resize, flip, rotate and convert images to various formats. The service is mobile-friendly, fast and easy to use.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Frozen Goodies - An advent calendar to get the chance to win daily prizes
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
24 Ways - An advent calendar for web geeks
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
CSS Christmas Calendar - CSS Christmas Calendar 🎄 is an experiment to demonstrate that almost any design concept is achievable with only HTML + CSS.No Javascript, no SVGs, no bitmap images.All code is linked and available, so you can dig deeper.