InfiNFT’s contract is an advanced tool with good functionality. However it neither is the most cost efficient nor the most practical. It is a very good independent alternative.

Likewise creating a custom contract in Rarible or doing gasless minting on OpenSea are alternatives with their own merit.

Furthermore beyond the Ethereum blockchain, VIV3 on Flow and SignArt on Waves blockchains are offering robust alternatives. However unlike the previously mentioned Ethereum based ones, these two are galleries not marketplaces. Having said that, there are a host of good galleries on Ethereum from Async Art, Nifty Exchange, KnownOrigin, Makersplace and SuperRare but all of these need to onboard you first to let you mint.