Twitterfontana
In my last post on the demise of Twitterfountain, I mentioned Twitterfontana as an alternative well worth taking a look at, but sounding a note of caution about over-reliance on any free Web 2.0 services as they can (and do) disappear overnight.
The next day I received an email from Jaap Roes, one of the developers of Twitterfontana, thanking me for the mention but pointing out that the source code to his service is openly available, meaning that even if his company had to stop providing the hosted service, it would still be possible for people to use (and customise) it on other servers. This is a very fair point and is definitely another reason to use Twitterfontana rather than one of the other alternatives.