FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
Uppy - The next open source file uploader for web browsers
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.
CloudExplorer - Cloud Explorer is a open-source Amazon S3 client.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Uploader Window - Easy File Uploader for your websites and apps