The DivX folks have just released a new (0.90) beta of their free (!) DivX / XviD player DivX Mobile Player for Windows Mobile and Symbian (note that while they state there�s no 0.90 for the latter, only 0.89, the internal version number does state it�s too 0.90). Note that you�ll need to register yourself in order to be able to access the app; after this, click the URL that comes in the e-mail, change your password and, then, go HERE to directly access the downloads.
Back in the pre-1.2.0 CorePlayer times, several Symbian people used to state (see for example THIS, THIS, THIS, THIS and THIS) CorePlayer was definitely inferior to this application. This is why I was extremely interested in the results of my tests. CorePlayer 1.2+ (on all the three test devices) has beaten DivX Mobile Player in every respect.
I�ve quickly tested it on several real-world (high-resolution; mostly 576- and 640-wide) DivX- and XviD-encoded videos. It delivered acceptable results on both the two Windows Mobile handsets (HP iPAQ 210 and HTC Universal running Ranyu�s 7.6 of WM6.1) and Symbian (Nokia N95 with firmware version v21) when playing back most DivX videos. There were rarely dropped frames (albeit the playback wasn�t as smooth as under CorePlayer).
Playing back my XviD-encoded test video, however, was painfully stuttering under Windows Mobile and a little stuttering under Symbian. (I REALLY recommend THIS video; pay special attention to the camera moving in the second sketch with the office dialog). The same videos played back flawlessly under the latest versions (1.2.3 for WinMo and 1.2.0 for Symbian) of CorePlayer.
It isn�t able to play back standard ASP videos created in Nero Recode (after renaming them to .AVI�s so that the player finds them); it complains about being incompatible. (The same videos, of course, play back OK under CorePlayer, as has also been explained in my H.264 Bible.) Of course it won�t play back the much more advanced AVC (H.264) videos either.
All in all, you may want to give it a try if you prefer free stuff � but don�t forget: CorePlayer is still much better, more compatible and more efficient. The only drawback of the latter is not being free.