I've been using Perseus, mainly for the lexica, but also for the classical texts. The powers who be (at Tufts) had finished a new Java-ized and XMLicated version (the older coding was in Perl) which they have now made open source. Of course it's huge amount of code and texts to download, and it only seems to work under Linux (and possibly Mac OS X), but I just thought I'd pass it along (link, 9 Nov 2007 accouncement). My main complaint about Perseus is that it's sometimes impossible to use because of all the folks using it.
