The TopOpenPlus map - the black and white style with German text - is currently down:
The future status is a little unclear - I can’t find any mention of it being discontinued, but also I can’t find it listed on the BKG site.
I likely won’t be able to get it resolved this week (due to some medical appointments), but if it doesn’t return, I’ll look at replacing it with a black and white style applied to one of the existing Thunderforest maps instead.
Thanks for your patience - if you’ve been using TPE or similar tools for a while, you’ll know that nothing lasts for ever, particularly map styles!
Stephen
PS. we track up/downtime of most of our external data providers on our status page