Which books are fundamental in terms of presenting the philosophy / theology of mainstream chasidut?
I know Chabad has Tanya, and Breslov has Likkutei Moharan.
Which sefarim are philosophically fundamental to non-Chabad, non-Breslov chasidim? Does this differ by sect? Are Tanya and/or Likkutei Moharan fundamental for them as well?
I imagine that R. Elimelech of Lizhensk's Noam Elimelech would feature on this list. What else is there?
I'm looking for philosophical works, not collections of stories or chassidishe vertelach, unless these are used (explicilty or implicitly) by chasidim to inform their philosophy.