There is a new release of psk31lx. This version has been updated to use pulseaudio. Some color was added as well. For a list of all the changes, please see the ChangeLog file.
Since psk31lx does not have a GUI (it uses ncurses), it will run in an xterm or even on a system without the X Window system. It needs very little CPU time, which makes it perfect for slower and smaller hardware. See my website for the download.