Here is a list of all documented files with brief descriptions:

FastIO.h
I2CIO.h
LCD.h
LiquidCrystal.h
LiquidCrystal_I2C.h
LiquidCrystal_I2C_ByVac.h
LiquidCrystal_SI2C.h
LiquidCrystal_SR.h
LiquidCrystal_SR1W.h
LiquidCrystal_SR2W.h
LiquidCrystal_SR3W.h
SI2CIO.h
SoftI2CMaster.h