Thank you

... to all the people behind WALS

That is: all the people listed at the WALS credits, the authors of the book and probably many more.

... to the adders of WALS-features:

1-29, 141
kaleissin 6
30-140, 142
Arthaey Angosii 6

... for the ideas to new website features:

... submitters of useful bugreports