Another vote for Kobold Press - it was founded by an ex-TSR staffer, Wolfgang Baur (They also behind Tyranny of Dragons, the official adventure).
Also Steamforged games, especially their "Epic Encounters" and "Local Legend" series.
Goodman Games put out great adventures with their 3E series of modules, though I haven't tried any of their 5E adventures.  Though if you can get a hold of their "Original Adventures Reincarnated" series (Into the Borderlands, The Isle of Dread, Expedition to the Barrier Peaks, The Lost City, Castle Amber, Temple of Elemental Evil) they are retrospectives, reprints and 5E remakes of old classic adventures.
Frog God Games has a handleful of adventures, some previously by Necromancer Games that are good.