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.
Anima App - Design, get feedback, convert to code, publish, iterate.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Sketch Repo - Collection of resources for anyone who uses Sketch
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Git Sketch Plugin - Version control for designers
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.