Nullpo is a simple drag-and-drop file uploader for OS X that allows to upload files to various "Pomf-clones". It also keeps a history of files uploaded and estimates the time of removal for uploads.
Pre-built application bundles can be found on the Releases page. The releases are not signed so they will trip Gatekeeper. Use Google if this becomes an issue for you.
If you wish to compile Nullpo by yourself, install the dependencies with Carthage by running carthage bootstrap in the project directory.