What does it mean by RESISTORAXIAL-0.3 in EAGLE Sparkfun resistor library?
I would expect that RESISTORAXIAL-0.3 refers to a footprint (PC Board pattern) for an axial leaded resistor, with mounting holes 0.3" apart.  

An axial leaded resistor is the common through-hole type.  0.3" lead spacing would probably be for a 1/8 watt resistor.  If I recall correctly, I usually used 0.4" lead spacing for 1/4 watt resistors.