PianoPub!

Elpis is a free and open source Pandora client for Microsoft Windows. It was created to provide a simple, lightweight and seamless way to enjoy music through Pandora while freeing you from the confines of a web browser and integrating into the desktop.

Fast - Hermes beats Flash, hands down.

Pithos is a Pandora client for the GNOME Desktop. The official Flash-based client is a CPU hog, and Pianobar is command-line only. Neither integrate with the desktop very well, missing things like media key support and song notifications. Pithos uses libpiano, the backend of pianobar, to create a better Pandora player.

“pianobar” is a free/open-source, console-based replacement for Pandora ’s flash player. Create, delete, rename stations and add more music. Rate and temporary ban tracks as well as move them to another station. “Shared stations”, last.fm scrobbling (using an external scrobbler), Proxy support for non-americans

Pandorita is a native Mac OS X client for the internet radio service Pandora. It is written entirely in Cocoa, and built to be lightweight, easy to use, and fully functional. Internally it uses the amazing pianobar library to communicate with Pandora's server.

Standalone Pandora client with proxy support (tortunnel).

Play Pandora from your Mac menu bar. A native app for Mac that stays in your menu bar (and doesn't clutter your dock while it's running). Allows you to control song playback and give your songs thumbs up/down ratings.

PandoraEnhancer is a Chrome extension that removes ads, displays song change notifications, and improves Pandora Radio's HTML5 interface.

PandoraBrowse is a mini-browser for Pandora that allows you to minimize the music service to the task bar.