OGG Vorbis
iTunes does not support OGG Vorbis, which makes me sad. The qtcomponents project used to fill that gap, back in the Panther/Quicktime 6 days, but that project has not done a thing to get it working in Tiger (more accurately, Quicktime 7). More on that in a later post, probably.
So what is an OGG-lover to do? I looked for native OS X OGG players, I really did. All the links were broken, and the promising players were broken or maliciously murdered (e.g. Mint Audio) by their authors. Audion 3 turned out to be the only one that could play OGG, but it has serious stability problems, is EOL, is not libre, and is crippleware to boot. No thanks.
Once upon a time (just after getting Tiger and finding the qtcomponents OGG compenent was broken), I tried XMMS (via DarwinPorts), but XMMS didn't play. Lot of good that did. Today I decided to try again, to see if it had been fixed. Sure enough, XMMS will play (with the ESD output plugin) and happily handles OGG files. Why, I might even be able to use IMMS! (But this much optimism should be discouraged.)