Penguin Keeper might know about other Vpets that use 'em since she's a master of non-tama knowledge.
Hah, thankyou!
But I've got a long, long way to go before I could be considered a master, I think!
Since I never liked the Tamagotchi Connexion line all that much, virtual pets that take cues from them and their sensibilities aren't something that I know a huge amount about, unfortunately (aside from the first iteration of Digimon, which could also just stand on its own, I don't find connectable virtual pets to be very fun or interesting). However, I do know of one line that might be relevant here.
So, kasichi, you might be interested in looking up a line called Power Palz. This was also sold under the names "Ani-Bip" and "Be-Bit", and probably some others that I'm not aware of, across Europe. As far as I know, they aren't region-locked, so it shouldn't matter where you get them from - they should still work together.
Power Palz featured various animals - I'm aware of a gorilla, rabbit, dog, cat, frog, and mouse - and you could use infra-red to connect them either to battle or marry. You could also cross-breed the various animal species. However, I don't know what the cross-breeds look like, or if they look different from their parents at all. That is to say, I don't know what the offspring of a gorilla and a frog looks like, or if you simply get another gorilla on the gorilla unit, and another frog on the frog one.
I learned about them from
//www.tamatalk.com/IB/applications/core/interface/js/spacer.png[/media]
This is the extent of my knowledge on non-Bandai virtual pets that took cues from the Tamagotchi Connexion line. I hope that it's useful!