[thinkmassive]

This is a great concise list, however I would add one more item:

* Create bounties for individual features/bugfixes using a platform like Bountysource

I've contributed small amounts to FOSS projects I use personally, because I'd really like to see certain features added (or bugs fixed) but don't always have the means or time to contribute my own pull request.

Pros: customers only pay when the feature/bug is implemented, no pager duty or support hours, easy to gauge demand so time is only spent on work that's most desired by paying customers

Cons: one-time revenue, payments might be low relative to the work required

If I had an open source project with an active userbase (one day...), I would probably combine bounties with Patreon and/or support contracts.