EvilSoundCloud is a web app for ripping tracks, albums, and playlists from SoundCloud. All music is streamed and assembled in your browser rather than on an external server. You can check the project out on GitHub.

For a single track, copy its url. It will look something like:

For an album or playlist, the url will be something like:

You can then choose to save individual tracks or the entire album as a zip archive.