NEO Icos are coming in 2018, and they all offer their own solution on participating the ICO.
Some of them want you to send NEO just like a regular transaction, but some of them (most of them) require a specific protocol.
Most ICOs were using Neon Wallet 0.0.6 because it had "participate in token sale" part in it, however newer versions like 0.0.7, 0.0.8, 0.0.9 didn't have that.
Now, with Neon Wallet version 0.1.1, ICO part is back! But this time it is not in the first menu, It comes after you login to your wallet.
You can check and download Neon wallets here: https://github.com/CityOfZion/neon-wallet/releases