We all know about Boost .
What other free C ++ libraries are worth using? What for? Can they be used easily with regular compilers?
See: What modern C ++ libraries should be in my toolbar?
Qt - , GUI, , , ++, . KDE Linux.
. ++ Java .
Blimey.... , . ++, , . boost. , , , , .
Xerces XML-. .
OpenCV ,
wxWidgets.
best unit testing system: https://github.com/google/googletest/
Allegro is my favorite for creating small games.
What libraries do you mean? To avoid wheel reuse, you can avoid it if you use Boost .