MySQL AB makes almost all of its money from the following sources:
- Training and Certification
- Licensing under very specific circumstances
And, from what I understand, the licensing revenue is a pretty small part of the pie. Not surprisingly, the first three are the same ways that RT, Shadowcat, and Stonehenge makes their money. The Postgres Foundation makes money from donations. I suspect many of the organizations that the PG devs live in support themselves in similar ways as the companies previously mentioned. I know that this is the case for both MySQL and Perl and Ruby.
My criteria for good software:
- Does it work?
- Can someone else come in, make a change, and be reasonably certain no bugs were introduced?
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