Is there a version of XTM for the Osaris?

No, for two reasons - the screen is too small, and there are incompatibilities between XTM and the Osaris.

In theory XTM should run on the Osaris, but because of the very small screen, there are restrictions. All PC programs expect to be able to draw a screen with 25 rows of 80 characters, and it is not possible to draw that many characters legibly on such a small screen. Not all 80 characters will be visible, even zoomed out to the smallest font.

Because of these problems we have never bothered to test and configure XTM for the Osaris platform. Although some users have had success running XTM on the Osaris, we are fairly certain that version 3.x does NOT work at all on that machine. We may review this position in future.