The ReactOS and Haiku projects have had a friendly working relationship for several years now, with each group helping the other whenever possible. These range from helping each other with conference attendance at SCALE and FOSDEM to development related matters. Haiku was especially helpful during ReactOS’ successful application to Google Summer of Code 2011, providing advice and feedback on ReactOS’ application efforts, and the ReactOS project remains grateful for the assistance.
The current ReactOS USB stack was started by Michael Martin, with Johannes Anderwald quickly joining in the development effort. Recently Johannes made significant progress in completing its USB stack, thanks to the reference Haiku's USB stack provided.