Planted might be a bit more popular than 0xcert. We know about 1 link to it since March 2021 and only 1 link to 0xcert. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Right now people only see the art pieces because thats what gets headlines. "Woah this nft sold for millions of dollars!" but there are other uses for NFTs. For example check out https://0xcert.org/ and look through some of their features to see what other things are possible, also Lukso which will be launching their main net in Q2 2021. They are working on some cool stuff too. Source: about 3 years ago
Two new ones I've recently stumbled across but haven't vetted yet: Planted.com - not sure if they're still going but emailed to ask Unicornhunt.io - european-focused startup job board. Source: over 1 year ago
Blockchain Demo - Visual demonstration of blockchain technology
Sequoia One - Outsourced HR designed exclusively for high tech startups.
Velix.ID - Frictionless Identity verification through Blockchain
Flex-Pay - Flex-Pay offers comprehensive payroll services.
Company Advisory verification by SpringRole - Verify ICO advisors on the Blockchain
SpringRole - A LinkedIn alternative on the blockchain