Uppy - The next open source file uploader for web browsers
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
AssetPicker - A free, easy to use, cross plattform ready asset or file picker.
PhotoBulk - PhotoBulk is a bulk image editor for Mac that was created for the best experience of batch editing. With this image editing software for macOS you can add watermarks, optimize and resize pictures, convert images or rename photos in bulk.
CDNify - Accelerate your apps and websites with the CDNify content delivery network. Superfast, simplified and affordable CDN for developers, startups and agencies.
IrfanView - IrfanView ... one of the most popular viewers worldwide.