What is it?
Acorn is an image editor by Flying Meat built with one goal in mind — simplicity. Flickr Export Plugin for Acorn by Coding Robots is a free plugin to upload your images to Flickr right from Acorn.
How to install.
Unzip and copy everything to ~/Library/Application Support/Acorn/Plug-Ins.
How to use.
Click File > Actions > Export to Flickr…