Like Ethereum, NEO and ADA are all platforms that other tokens can run on.
What other coins out there are platforms?

Here are some coin list which have their own platform and good for ICO platform alternative.
KOMODO PLATFORM: KOMODO have an DICO (decentralized ICO platform). MONAIZE was the first dICO from komodo platform
STELLAR LUMENS: They also good for ICO platform.