Its a function really of knowing what exactly you are looking for and how far you are willing to go to install it.
I've ran an XMPP/Jabber server in the past (actually i still do at my office) With one of these on a Pi or similar you could run a fully featured Instant Messenger network that is fully self contained and isolated from the internet (though the protocol actually supports contacting other XMMP servers too, if the mesh some how linked into an area that had an XMPP server its as simple as doing someothercallsign@nodecall2.local.mesh and the server will find out how to get there.) You end up with your own Instant Messenger network (Similar to AOL/Yahoo/MSN/etc) XMPP also supports "conferences" usually (multiple people to a room) and can support (depending on software on clients and server) support video chat as well.
IRC Chat servers are often common for running chat rooms, though there were programs called "chatterboxes" in the past or "page chats" or similar simple perl scripts that store all the text in a file on the server and require the browser to refresh each time to get that page, but they work and do their job (I can understand the need to not install software). You could also pair up an IRC server with a web based IRC chat client (KIWIIRC is common -- simple java script runs on basically every client device out there, the server part however will not run on a mesh node (Size and instruction set) and I don't think even works on a Pi serve, but will support pretty much anything as a client, so a small x86 pc could run it)
Going to simpler, if a BBS is what you want/need/remember/like, why not actually run a BBS? A quick google: http://en.wikipedia.org/wiki/List_of_BBS_software and just run it across in telnet or similar for clients? (note: you do have to enable the telet client on newer windows PC's but its fairly easy to do) The mesh is a powerful network tool, but it is just that a network tool. Add to it, extend it, and make it your own. A lot of what worked it packet may still work today, an a lot can be extended. If you could do it over packet or dialup modem it can VERY likely be done over the mesh.
You also don't need to pull in a mesh expert to make software like this run, usually you can pull in a local guy who is good with servers and they will usually understand how to setup what they need to setup and you just plug your mesh node into it next. If they question the network for their standpoint all they need to know is to think of it as "the cloud" it gets from one end to the other, that usually good enough for a server/network guy to know they can do what they want with it.
And again as always I recommend not running the software on the node if possible and let the nodes be nodes
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