Gitcoin is a popular platform (opens new window) for developers to collaborate and monetize their skills ($25 million+ so far) while working on Open Source projects through bounties and hackathons. Protocol Labs recently co-sponsored their Gitcoin Grants Round 9 Virtual Hackathon (opens new window).
This is a companion discussion topic for the original entry at https://blog.ipfs.io/2021-05-10-gitcoin-gr9-recap/