Libraries are sets of Subroutines and/or Functions that are written in XC=BASIC or assembly language and provide shared functionality to be used in your program.

The following libraries are packaged with XC=BASIC:

• TRIGONO.BAS - library that implements fundamental trigonometric functions
• X16.BAS - library to access the improved functionality of the Commander X16

• Orlof's XC=BASIC 3 Libraries for C64, including:
  • Bitmap Graphics Library
  • Character Mode UI Library
  • High Performance Random Number Generator Library
  • Josystick Library
• xcb-ext-reu - RAM Expansion Unit (REU) extension for XC=BASIC and C64/128 computers (by Locodarwin)
• Thraka's XC=BASIC extensions