Slimfast and Complan off the top of my head. And those two have been around for decades. MyProtein sell simular stuff that is more balanced than whey protein + whole milk for a meal replacement. Also, whey + whole milk + instant oats lets you control the macros fairly well, assuming your getting all your micro-nutrients from real food elsewhere. And this is without looking on google. Id bet there are many many more. All the own-brand versions of slimfast for example.
I know those, and they don't match any of my criteria. Slimfast has no flavors that aren't dessert drinks.
For a 400 calorie serving of Slimfast original, it's over 36g sugars (vs 9g Soylent). Slimfast Advanced has almost no sugar, but is "sweetened with non-nutritive sweetener" (from their website). I can't find which actual sweetener it is, but most artificial sweeteners upset my stomach and taste more terrible than sweet.
Complan is also loaded with carbs, (33g sugar + 30g else) and has no fiber.
They're marketed as meal replacements, but I don't see how they're anything but vitamin enriched milk shakes.
