[minorninth]

PostgreSQL, like many other open-source projects, has sponsors and accepts donations. Here's their sponsors page:

https://www.postgresql.org/about/sponsors/

Also, I think it's important to note that a lot of contributors aren't volunteering their "free time", they're being paid by some other employer to contribute to PostgreSQL as part of their job:

https://www.enterprisedb.com/blog/importance-of-giving-back-...

[btilly]

If you read https://www.postgresql.org/about/policies/sponsorship/ you'll find that the list of sponsors is essentially a recognition for companies paying their employees to contribute to PostgreSQL.

It isn't for contributing into a pot of money allowing some central PostgreSQL committee to hand out money for other things, like hiring people to do documentation.