Maybe it was safe before, today June 15 is not. When executing the download of the official RPCS3 page, the antivirus alerted me of the IDEP.ARES.generic (Trojan) malware on the system. Watch out.
Open source beta for the PlayStation 3 emulator. Note that this is the REAL version of the emulator and not Playstation3emulator dot net which hosts malware.
A safe, open-source PS3 emulator that's still in beta! As a result, many games run with slow, choppy frame rates. But, the final product looks very promising!