This year, the Free and Open Source Software Developer's European Meeting ([http://fosdem.org/2010/ FOSDEM], Brussels, 6-7th February 2010) will host the Alt-OS devroom on sunday from 10h to 17h, which is meant as a place for Free and OpenSource Alternative Operating System projects to share ideas and work on topics like: * distinguishing design and features, * device drivers and how to share them, * application portability, * interoperability. We are interested to hear about your OS projects, how they are designed, and what they could eventually share for other projects' benefit. We are also willing to exchange with related devrooms on transversal subjects, depending on the available schedule, for example unusual package management with the Crossdistro room, GUI standardization with the Crossdesktop devroom, scalability with the Embedded devroom, how you have reused drivers from BSD in your project, or your concerns about porting Java…