Once you install Starkjit on a dedicated machine then access to Starkit applications is web based and supports all modern web browsers on all operating systems such as Internet explorer , Mozilla Firefox, Chrome , Opera e.t.c
Additional Software will need to be installed on your computer for the purposes of file syncing to your cloud storage and video/audio calls. Again, those desktop clients are multi-platform and will run on all popular operating systems including Windows(Versions xp, vista, 7, 8) ,MAC OSX 10.6 and above , Ubuntu , Opensuse and many others.
For your mobile, there is also software available for both Android and Iphone OS for file syncing to your Starkit cloud storage and for secure audio/video chat. that will work with your Starkit appliance.