Foundation
Can create custom Collections with your own smart contract https://help.foundation.app/hc/en-us/categories/4419488061083-Collections
Walk through of collections, including “splits” where funds go to other accounts https://help.foundation.app/hc/en-us/articles/4419002081051-A-complete-guide-to-creating-a-Collection-and-minting-an-NFT
You need to verify a Twitter and/or Instagram account and fill out your profile, and get an invite to be allowed to create
Set royalty of 10%, 5% to Foundation on every sale.
Rarible
Supports Ethereum, Flow, Tezos, Polygon
Supports single ERC721 or multiple ERC1155, using either the shared Rarible contract or a custom contract.
Supports “free minting” — where the buyer pays the gas fees for minting.
Custom royalty from 0-50%
Custom metadata
Unlockables on purchase — for example a coupon code or additional benefit.
Test minting on Rinkeby or Ropsten Ethereum testnets https://rariblecom.zendesk.com/hc/en-us/articles/4406495352205-How-to-test-features-on-Rarible-free-of-charge-
Zora
Royalty from 0-100%
Manifold Studio
Manifold Studio combines the power of a Manifold Creator Contract with a seamless user interface to mint your own NFTs with zero coding required. As our next step in building for top creators, Manifold Studio allows you to mint original high-quality NFTs while retaining true ownership and provenance of your work.
Being worked on by forum member @jtgi and founders are from Vancouver. Here’s his plug:
“Sovereign contracts” means you own / deploy your own smart contract vs a “shared” contract with less customization.
Async Art
Very unique platform for a lot of generative art
Has the concept of layers and blueprints and artist to artist collaboration built in.