Pynagram is a small and simple anagram-typing game that may lack fancy features...but it offers a quick, challenging, and addicting gameplay to make up for that.
It basically presents you seven letters that you may use to type as many words as you can in a 5-minute span. Two-letter words are not allowed.
Where to get it? I got it from Debian repos, but you can visit Pynagram in Launchpad for more downloading options: