Most of the developers you mentioned are still around and still cranking. Panic and Rogue Amoeba in particular. Others have emerged, though there's a lot of crossover with iOS these days, since people want their data available across their devices. Bear and Things come to mind; Dash by Kapeli; The Archive; Kaleidoscope has been reinvigorated by a company that seems to know what they're doing; Alfred; Paw, Proxie, and Proxyman... they are out there.