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One more early-morning thought on UNA, since it's what this whole network runs on. What I like most is how modular it is. Events, discussions, channels, groups: you switch on the pieces your community needs and leave the rest off, and nothing feels bolted on.
The built-in options for paid memberships and the room for customisation matter more than people expect, too. A community that can cover its own hosting bill tends to stick around. More on the modules at unacms.com.