In my opinion the Phoenicians and their Canaanite ancestors are a good candidate. They were at some point the real cradle of civilization between three large empires. Many things we think other people invented actually was Phoenician and the Greek highculture would have looked a lot diffrent without them. Phoenician families in Athen had a status as Metöks that gave them much more freedom and influence than many citizens and when we look at the Persian Navy than it was actually a Phoenician one. People tend to look in to the Carthaginians and they are awesome as well but the motherland was so much more influential because it was in a more crucial spot. Of course they got influenced by others as well, but no one transferred innovations as wide as the Phoenicians.