Love your classics? I sure do! Ultima Underworld 1 & 2 plus Syndicate Plus and Syndicate Wars have returned to GOG and you can get a copy of each free.
It's a little odd because EA originally requested their removal back in June, when GOG announced they were being delisted at the "publisher's request". It was probable that EA wanted to pull back more of their own stuff from GOG onto just Origin, with the games already available there.
About the games comes back to GOG, EA said: "Syndicate and Ultima Underworld are back! It seems that twenty years on there’s still plenty of love for these titles so we’re pleased to confirm that effective immediately they’ll be available again on GOG, and we’ll be keeping them in the store for the foreseeable future. To celebrate this we’re offering these games as a free download for four weeks."
Did you buy them before? Apparently, according to some GOG user comments, there's a refund link in your GOG order history so that's quite nice too, although GOG did not officially announce this.
All of them can be run with DOSBox, so playing them on Linux gives you just as good an experience as you're likely to see on Windows.
Find them all here on GOG. You have until September 3 to claim them.