Firechat : closed source, only group chats, no crypto
Bluechat : only group chats
Pinwheel Messenger : only messages to direct neighbors (no routing)
In contrast, Ensichat is for 1 on 1 chats, uses mesh routing and signs+encrypts messages.
Are there any other, similar projects?
I think I like Wifi more because it allows true meshing on long distances, and the Serval project uses simple phones with the application as routers.
And if there's an app that misses a feature I would guess adding the feature should be less work than writing a completely new app that has all the features plus the new one. Especially 1-on-1 chat is a subproblem of n-on-n chat. Make a max 2 people "chat room" and you're done.
"No crypto" is a feature, btw. It's very very very unlikely that a small open source project can get the right talent to make a secure chat app. Also I'm no expert but it might be impossible technically, with how the App infrastructure is designed and the flash storage that can't delete data at all and can't predictably overwrite it. So if everybody who tries it fails you do your users a favour by not trying and openly telling them that it's not secure. Tell them to use a Laptop and PGP emails for these usecases.
Personally, I find this project really interesting.
Regarding range: Messages are forwarded by nodes, so with enough nodes, much more than 100 meters can be covered. And the upcoming LTE Direct  will have a range of ~500 meters.
Do I get notified when my device has successfully forwarded something through a passer-by? That would motivate running it a lot and might be a nice viral effect.
Sadly the routing looks pretty simple. I was hoping for something that could give my local events like weather, road conditions, etc even when there's no network coverage.
Imagine if oncoming traffic could warn you about what you are going to hit in the next few miles?