The only English learning resources I know of are Englishpod101 and Antimoon. Neither are like TextFugu though, but may as well mention them :)
I just remembered, Koichi has a Japanese Tofugu counterpart – it’s called “Koichiben”. It’s written in Japanese and is about American culture. No idea how often he updates it, but it used to be very infrequent from what I remember. There used to be a whole bunch of articles, but I can’t see anything past the first page :( Aha, as far as I can tell, he’s “restarted” it, but he says he’ll repost the old articles in time. He’s not a native speaker, but I’m sure your students will find it interesting :)