So, it hasn't been mentioned I assume, but there is a bit of a weird (and by extension a decade to decades old, based on the game) lifesim game series, known as Creatures.
The fandom is still active based on what site you visit, and there is an extreme amount of user made content.
Only 1 of the games is Freeware, and that game, unless expanded upon, or connected to their third game, is limited.
Now, it isn't for everyone. The Creatures in the game, Norns, Ettins, and Grendels are a bit cartoon-y to say the least (however many agree the Creatures Online Norns are too realistic, and are just plain creepy). This is a main part of it's appeal, though, you can always slap that cute little thing to death, or try to breed it to be an alcoholic. Even place a norn who's health is dependent on being infected with toxins and viruses, among normal ones. You could then watch it infect all the others, eat some healthy food, and die from it, while the others die from the diseases their newly deceased friend carried.
You could just, I don't know, raise them to live 'happy' lives though. I say it with quotation marks because the Creatures honestly don't have a pain sense like we do, even though they have drives telling them they were just hit and it hurts. Drowning a Norn isn't like Drowning a Dog, sine Norns can be pretty stupid, and if they can't swim, they'll often just sit under the water until they die. The dog will be harder to drown, and will much likely take effort.
Though, you have to admit for the time, they were pretty advanced.
I'd call it Strategy/Life-Sim/Space
It really doesn't fit into any of the genres, for the most part. Some people introduce conflict, or let the species and breeds they choose run solo, and see how long they last, if they do.
Wikipedia's Article on the SeriesDocking Station (The Free One)'s Article on the Creatures WikiSince the company that made the game series is pretty much defunct (though Creatures 1-3 can still be bought online, via Gog.com or otherwise), the online play function is no longer around, and hasn't been for a couple of years. That is to say Docking Station used to have online play, via the Warp Room. Nowadays, there are users that are rebuilding the online play, and plan on bringing it back up.
Originally you needed to register an account for free, and login/register each 'world' you made, but the fans made a workaround, so offline play is completely available.
A Decent Docking Station Site With DownloadA link to a page with the login disabler and other addonsSorry if the info is a bit much, I didn't see Docking Station on the list, and I felt if I just gave a simple link, it wouldn't be enough.
EDIT:
Engage to Jabberwock seems a broken link to another blog, I think inverted castle, which is a torrent file, as opposed to what I understood was a zip file