Why has SourceForge accepted the AdvanceMAME project and not the xmame project ?
SourceForge accepts only Open Source licenses. The source distribution of AdvanceMAME is released with an Open Source license. So, it was accepted. The xmame is released with the “MAME License”. The MAME License isn’t an Open Source license as defined on http://www.opensource.org/. So, it was rejected.