It would be interesting to have an option to pay for desired new features in existing projects. You could call it "bid for code" or something: people who need a certain feature in an open-source project would commit to paying some amount of money for it. Other people interested in the same feature could also join. A bit similar to a kickstarter, but for feature requests. Developers would choose what to work on, depen…
And sometimes I just walk into GitHub and @ the contributors and offer money like this https://github.com/jekyll/jekyll/issues/3337 Some people complained but fuck 'em. End result, hired somebody and got the job done.