I'm a few months into my experiment with doing OSS development without any use of GitHub whatsoever, and while I had to introduce a minor exception, it's mostly been quite successful. Difficult, but successful.

Tricks I've found:
- Spend money. Maybe not a hell of a lot, but more than zero. What GitHub provides is subsidized in the interest of locking you in. Going without GH means spending some cash.
- Have friends. None of this would be possible without friends lending me infrastructure.