Update #8:
Tested several of the installed applications recently, and I appear to have a bunch of programs of the same variety. Having so many video converters, wallpaper switchers, audio players, disc burners and image editors is probably going to lead me to have to narrow down which ones I want to actually keep and determine which ones have the most utility to me. It's usually the one that is the most recently updated (e.g. one last updated for Tiger in 2011 vs last updated in 2006 and then abandoned while it was still in Beta, trust me that happens far too frequently with the programs I've found). My contextual menus are getting too cluttered when I control-click (right-click) a file and select "Open With" and out comes an unnecessarily long list of several of the same kind of application.
I mentioned having more than one wallpaper switchers. Yes, I ma still enjoying ChangeDesktop, no matter how often it crashes or ignores my selection of "No Repeat Pictures". Yes, the background daemon does crash if it's dissatisfied with the amount of RAM left available for use on my machine. I have a different wallpaper switcher that's a menu applet instead of a "docklet" like ChangeDesktop is, but I think it has less features. I haven't done a comprehensive comparison as of yet.
One audio player I tested, Vox 0.2.7.1, claimed on its homepage that it could play module/tracker music like .mod, .xm, .it, .s3m, etc., but upon testing that on my iBook, I found that that was absolutely not the case. Other than that, that program is quite possibly the best audio player on Tiger I own now; it has a customizable look right from its Preferences menu, it has a built-in equalizer, it can display album art and metadata/tags, export audio to various formats, automatically loads all music from a selected folder into a playlist, and best of all, it includes a menu applet for controlling playback. Awesome! No other player I've tested comes with such a convenient feature. Here is the homepage where I downloaded Vox from on the WayBack Machine:
https://web.archive.org/web/20110714015643/http://www.voxapp.uni.cc/. The program's homepage also didn't mention any PowerPC compatibility either, so I just had to see if it did for myself on my iBook. Below is a picture of Vox running with its "Effects" window and "Media Info" drawer optionally opened, all customized to a red color. Viewable in the picture is Vox's menu applet next to VirtueDesktops. All in all, it's too bad it's not open source, though, and the website shut down around 2011 so it never saw a final release. It's still forever in Beta development...
(Amendment: actually as I was just writing this, I discovered that the app is still in development, and it's just that the domain name for the app's original website expired and the developers moved to a different domain in 2011 and then again in 2016/17 according to the WayBack Machine, they currently have an iOS version as well) (AGAIN as I was writing this, I discovered that Vox is preserved on the Macintosh Garden. Clumsy me, in my independent search for old programs, I must have stopped assuming that everything I found was preserved on to the Garden. Here you can download the latest compatible PowerPC versions for both Tiger and Leopard: https://macintoshgarden.org/apps/vox-02x). Here is the domain that the Vox team apparently moved to: https://web.archive.org/web/20130925095257/http://www.coppertino.com/. Here is Vox's current homepage if you're interested: https://vox.rocks.
Vox - cool application; it gets my recommendation. Let's talk about players that actually DO module playback though, such as Cog, XimpleMod, and CocoModX, the latter of which is becoming my favorite and preferred way of opening module files for playback. CocoModX was created by the independent developer Sven Jannsen and is hosted at the Macintosh Garden, and you can download it here:
https://macintoshgarden.org/apps/cocomodx. Though, curiously, the rest of Sven's applications are not preserved on the Garden, such as the brilliant CocoViewX, which I will get to in a moment. CocoModX includes an Apple-inspired "Brushed Metal" look, if you're into that, that can be toggled off, a floating audio playback controller (that always stays on top of all other windows) whose transparency can be altered with a slider, and a playlist menu that can be edited, of course. It is far more stable than Cog and far more feature-rich than XimpleMod, so I'll be sticking with CocoModX. There's also MilkyTracker, which serves a dual purpose in both editing and playing module files. Below is a picture of CocoModX, with its Playlists drawer opened and its floating playback window set to a transparent look, with a sample playlist loaded for your viewing. Also as you can see, I have one of my few preferred ShapeShifter themes installed:
What a wonderful application CocoModX is, better than Cog in my opinion, which in my case kept crashing upon loading what the program felt to be too many tracks into a playlist at once. Or it just crashes randomly upon playback of files it doesn't like too? Whatever the underlying issue may be, CocoModX in my mind will probably become the de facto default mod player for my tastes and I'll uninstall Cog and XimpleMod just to clear up any of the clutter and confusion in contextual menus when I open up a file and it starts playing in XimpleMod instead of CocoModX, or I control-click (right-click) a file and select "Open With" and out comes an unnecessarily long list of several of the same kind of application, as is the problem with having so many of the same kind of application as I mentioned earlier. Let's eventually uninstall any of the less desirable applications that report to do the same functions, shall we? Yes, some day...
Some other programs I installed ended up failing their task miserably, or, what has been occurring with me recently, is that the program I thought was freeware ended up being trial software with no way of activating it since the activation servers and websites are long gone (not that I would want to pay up for a 10+ year old application, let alone at full price anyway). I open an application and get a surprise that I currently have X amount of days left before my demo ends, or some sort of critical functionality is prohibited from being used until I fork over X amount of cash to a long dead company. Neither scenario gets mentioned on the homepage of the program I downloaded from, mind you, so that's a real stinger. Because of the broken/poor programs and the surprise trial software, there have been a handful of applications in which I have chosen to uninstall and write to myself not to install them again on other systems. Of course I'm keeping a catalog of the hundred or so programs I've found on the Garden and on my own. The list is looking somewhat disorganized at the moment due to the sheer size it has approached.
I'll detail you on one program I had a horrible experience with. This program in question was meant to be another one of the 6 or so image converters/editors I have now. Written in Java, this program hanged for several seconds before letting me quit the app, ramping the CPU usage up to 90% just to load an image, and consumed nearly 100MB of RAM. I didn't bother with it after that, there's no reason for such an app to be so resource-demanding that it hangs the computer when other more capable image editors sing on PowerPC and don't consume more than maybe 50MB of RAM, depending upon how large the image library you're loading is. Sven Jannsen's CocoViewX can load a directory filled with hundreds of images on my iBook and I can still navigate OS X just fine. No hiccups or hangups to go along with CocoViewX. That program can bulk convert, bulk compress, bulk resize, bulk export, and bulk rename image files, load thumbnails, and comes with a slideshow option comparable to iPhoto's. It, too, like CocoModX, comes with a "Brushed Metal" aesthetic, but you can disable it. CocoViewX doubles as a sort of file manager, too, but reasonably only for navigating to which image library you wish to load. CocoViewX is powerful in comparison to its competitors.