LambdaMOO is a fully programmable text-based virtual reality.

Here's the LambdaMOO programmer's manual: https://hayseed.net/MOO/manuals/ProgrammersManual.html

Webpage: https://www.moo.mud.org/

Other resources: https://github.com/johndoe771/lambda-moo-programming

And for LambdaMOO itself telnet to lambda.moo.mud.org 8888.

For a telnet client, https://mudlet.org is something FOSS and crossplatform you can run (disclaimer - involved with project)

If you are looking for an interesting LambdaMOO like MOO to check out, I'd recommend ChatMUD (it runs a fork of LambdaMOO called ToastStunt). You can connect from the we. Using this webclient: http://pubclient.sindome.org/player-client/?gh=chatmud.com&g...

Or if you don't have telnet installed, you can use the `-t` option to netcat.

More resources for those interested, probably the most comprehensive and up to date site: https://lisdude.com/moo/

Very cool! Last I looked Lambda Moo and related topics seemed to lead to a maze of defunct ftp sites and occasionally a web site. Glad these aren’t completely lost to time.

I guess? I logged into it and there was some basic world that must have been out of the box demo data, and it seemed like basically a REPL where you could create objects like rooms, and verbs, and a verb could move you to a different room; so like a REPL with state like a shell's pwd and environment. I would just carve off rooms, I think I made some chest-like things. You'd write tons of text for different verbs people might use.

I can't remember any of the code, at all, now though. Just remember constructing "The Ethereal Plane" with all sorts of cloud metaphors for computing back before that was cool~

I spent many many hours playing/coding/wizard-ing with several Star Trek themed MOOs and an original space themed version. I thoroughly enjoyed the language and environment. MOO is really where I initially grasped and thrived with OOP.