Perhaps it's an old news but I can't connect to TinkerKit website and it appears to be down for many days.
Unfortunately I do have quite a lot of they HW and information is not available anywhere else.
It's really strange. They HW is still available everywhere and I guess a lot of folks have it but they just disappears and no support left (no info and not working website).
Not the bed business model for sure.
I was trying to get some answers from "official" arduino email but they just point me to they store page with tinkerkit modules for sale and no further respond.
Very strange and not proper situation. I wouldn't buy it without any support (like tutorials) and now I left with plenty expensive isles HW and many others as well.
In your situation for students I think it costs you a lot.
I can assure you that the website will be back online but, I can't tell you when precisely. We are working to be back as soon as possible.
At the moment I don't have further information.
Do you know any kind of sensors/actuators that could be directly connected to Tinkerkit sockets available in Esplora board and Motor & USBHost shields? In other words: a drop-in replacement. Thanks
All the tinkerkit gear is turning up on surplus shelves such as princess auto etc so going to say they went pop.
I still have one of thier LCD leos in action.
As of March 30th, 2018, I am unable to find the website. One of their packages I got from amazon seemed a little flattened and old/scuffed. I agree with ballscrewbob when he suggested they went out of business.