It is unfortunate to report at this time that Razer has yet to create any Linux drivers/software for their mouse, or alternatively release their specifications to allow for the open-source development of such an alternative application (similar to Logitech mice and lomoco). We have asked Razer about possibly serving open-source users, but to this point, we have received no official response. However, even using the genericwheelusb driver, the Razer Krait (as with the Copperhead) operates flawlessly under Linux with the exception of using the Razer-specific options that are found within the Windows software.
For testing we had used the Razer Krait in conjunction with a Linux desktop running Fedora Core 5 with the 2.6.16-1.2096_FC5 kernel and X.Org v7.0.0. Outside of not being able to use manufacturer-specific software features, there were no Linux compatibility problems with the Razer Krait.
While mouse testing can be very subjective depending upon personal preference, we focused on running the Krait through an array of various games, as well as general desktop Linux usage. The games used for testing was Unreal Tournament 2004, Quake 4, Sauerbraten, X2 The Threat, and various open-source RTS games. While the games natively available under Linux are not nearly as elaborate as some of the complex Windows titles, we had experienced no mousing problems -- even when resorting to action-packed Quake 4. All mouse movements had responded effectively and there were no problems with any of the buttons or tracking.
Under general desktop usage with GNOME v2.14, the mouse had faired well with the various programs. Of the programs used were OpenOffice, Firefox, and Blender 3D. While we have been accustom to the highly sensitive Logitech and Razer mice, it did not take much time at all to be acquainted with the controls and responses from the Razer Krait. With that, we had no complaints about the size of the mouse, after having extensively used the Razer Copperhead. The mouse pad used during testing was none other than the Razer Mantis.