Creating welcoming communities within open-source projects is a recurring topic at conferences; those projects rely on contributions from others, so making them welcome is important. The kernel has, rather infamously over the years, been an oft-cited example of an unwelcoming project, though there have been (and are) multiple efforts to change that with varying degrees of success. Hans de Goede talked about such efforts within his corner of the kernel project in a talk (YouTube video) at Open Source Summit Europe.