Wild Apricot looks interesting! Membership, billing, and CMS is 3 out of the 5 majors (the other 2 being forums/lists and wiki). I hope that price includes some rock-solid support and lots-of-nines availability, because yeah, it's a chunk of change.
I had found Groupspaces early on, which covers everything but wiki, but advised against it because there's utterly no succession plan if they get acquired/dissolved/whatevered. Clouds are known for being somewhat ephemeral, after all! 
In hindsight that was probably the wrong call; I think we would've dealt with such a dissolution if that had happened, but in the meantime we've spent years trying to home-grow something that there just isn't enough support behind. 
I'm curious if anyone here has experience with Groupspaces or other platforms that provide even more stuff than Wild Apricot. Mostly, how extensible these various systems are -- if you set up your own wiki, for instance, can you have users auth against their Wild Apricot identities? Can the database be coerced into tracking additional info (like RFID key bits) sensibly? 
How about guest sign-in systems? Makers Local 256, in their "dream television audition tape" which was posted on a thread here last week, mentioned having written a sign-in system that lets visitors log their details and sign up for emails, but I can't find it documented on their wiki, probably because I'm not searching for the right thing. This is something I think there's a lot of room for development of within the community, and I'd like to hear what's out there before imposing my feature-wishlist on the discussion. :) 
-Nate B-
Jens  wrote:
>                 At MakeICT in Kansas, we are using Wild Apricot ($50/month) for member and event management, including payment processing and automating access control for our space, and Wave Accounting (free) for keeping track of our finances.
> JensTreasurer, MakeICT
> On Tue, Nov 4, 2014 at 10:17 AM, Edward L Platt <ed@elplatt.com> wrote:
> > Seems like a lot of spaces have developed their own software to help manage things. This Saturday, as part of the Aaron Swartz hackathon, we'll be compiling a list of what's out there, trying out and reviewing as many as possible, and sharing our results.
> Know of a good one? Let me know so I can make sure it gets on our list. Also let me know if you're interested in helping out (which you can do from anywhere).
> Happy hacking,-Ed
> 
> -- 
> Edward L. Platthttp://elplatt.comhttp://civic.mit.edu/users/elplatthttp://i3detroit.com@elplatt
> This electronic mail message was sent from my desktop personal computer.  Please forgive any long-winded, overly-prosaic ramblings.
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