Requires Mac OS X 10.12 (Sierra) and a Flickr account
F-Stop supports multiple Flickr accounts at the same time. You can browse all your accounts easily without logging in/out.
F-Stop has powerful uploading options: multiple schedulable uploads, directory uploads using original file names or defined names. With support for tagging and upload resizing, F-Stop can adapt to all your needs. If you are a more experienced user, you can even use Applescript to build your own customized workflow