From LCG version:

• LCG Application Area:
  • ROOT (persistency)
  • []relax
• Externals:
  • Boost
  • AIDA (histogramming)
  • Xerces-C
  • Python (scripting and interactivity)
  • HepMC

See also:

• GNU Standard Template Library
  • gcc 10.3.0
• C++ Reference
  • http://en.cppreference.com/w/cpp
  • http://www.cplusplus.com/reference/