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Factor seems to be the only modern[1], mature, actively developed concatenative language right now. But I'm not really a concatenator so I can't tell for sure.

[1] Though maybe some Forths can be considered modern.

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Kitten is an exciting, actively developed, statically typed concatenative lang: http://kittenlang.org/

Yeah, I hope evincarofautumn keeps chugging along with it. Last I saw I liked the ideas/philosophy behind it. Nice to see that the front page has a more interesting code example than last time I checked the website out. Readable use of matrices must be one of the biggest doubts that people in general have when it comes to what concatenative languages can pull of cleanly.

Is it somehow related to Cat language (http://www.cat-language.com/)?

Yup, it is. From the FAQ:

"It’s also intended to be a practical successor to Cat, which was the first statically typed concatenative language."

People interested in both array/APL-like and concatenative languages might want to take a look at lang5.

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