What are some examples of highly successful volunteer-only open-source projects, besides GNU and Linux?

It is the exception rather than the norm for open-source projects to rent-seek. I think that having a highly-visible list of successful open-source projects that don't claim a cut of their users' revenue will be helpful in this ridiculous IFP debate.

submitted by /u/insanityzwolf
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source https://www.reddit.com/r/btc/comments/ir8ne2/what_are_some_examples_of_highly_successful/