Yeah, I’m actually on the LycheeOrg team helping to manage new updates, etc. It runs on a LAMP stack, like Alan and Jev said, so it’s easy to spin up.
There’s a major update coming in the near future that uses a new PHP framework called Laravel that makes it essentially database agnostic, so it’ll be much more flexible. Most of the work I’ve done has been to improve licensing at the global, album, and individual photo level. We’re really responsive on the GitHub isses page, so if you want to see something added (or if something isn’t working) add a request there.