What are the types of Black and White film developers?

Answer:
Forgive me if I don't provide the answer you're looking for; I'm never certain of the intent when the word "type" is used.
I could answer "powder" and "liquid" or "high contrast" and "normal", or perhaps "types" means manufacturers to you. How's this...

Kodak D-76, Microdol-X and T-Max; suitable for Plus-X Pan or Tri-X Pan
Ilford ID-11, Ilfotec DDX, Microphen, Perceptol; suitable for Ilford Pan-F Plus
Ilford FP4 Plus (ISO 100); HP5 Plus (ISO 400)
Agfa ISO 100 films: Refinal, Rodinal, Rodinal Special

Contrast, as referred to above, is a characteristic of the developer to a degree, and may be modifiable via dilution in some developers, often with a corresponding affect on acutance. These, by the way, could be added to the list of types above as some might consider high acutance or high contrast developers as types.
First answer by Micron. Last edit by Micron. Contributor trust: 117 [recommend contributor recommended]. Question popularity: 1 [recommend question].