There are many wallet options. For Mac, you can use either the web wallet (platform agnostic) or else the Neon wallet specifically for Mac. The Neon wallet is made by City of Zion, which is NEO's open-source developer community and is endorsed by the NEO Council. So yes, it is 'official'.

All wallets linked on the lower right here:

https://www.reddit.com/r/NEO/

For those debating whether to leave coins on an exchange:

If you use Binance or Kucoin, then sure, you might consider it. You are slightly increasing your risks, though, in the unlikely event an exchange closes or the somewhat-more-likely event that regulations change and your coins are trapped until you jump through a bunch of bureaucratic hoops.

If you are using an exchange that doesn't pay you in GAS, there is zero reason to leave your NEO on the exchange unless you're day trading or you only have like 2 NEO. You are incurring the same risks as above, PLUS you're paying the exchange your GAS, which is silly. Once NEO holders begin to receive GAS fees for network transactions, you'll be losing out on those too. If you're planning to hold your NEO for a while, the amount you make make in GAS and security will more than compensate for the tiny fee you lose to withdraw.

Holding your NEO in your own wallet is safer, makes more financial sense (again, unless you're day trading), and it's so easy there is no excuse not to do it.