Not exactly an app, but a few years ago, I had a lexicography lecture where we used the website Lexonomy. The interface is quite easy to understand once you get the hang of it. I don’t know how easy it is to use it and edit stuff there within a phone browser though.

maybe that’s blatant self-advertising, but you might want to have a look at my origami community I created a few weeks ago (and if it isn’t something for you, others might find it interesting)… no drama, no politics, just simple paper folding, I promise :)

Here’s the link: !origami@feddit.de

Wow, that sounds like a hell of an adventure! I don’t have any experience in cave exploration, so I would like to throw your own questions back at you: what was the most interesting thing your group found in a cave? What are your most memorable experiences linked to cave exploration?