The links below are for software tools the CCC has found useful and helpful in Stage 1 and 2 competitions,
along with software links provided by the IOI (International Olympiad of Informatics).
Java SDK (Software Development Kit), for PCs and virtually any other platform:
http://java.sun.com/. See the "Popular Downloads" section
on this page.
DJGPP, a free C/C++ system for PCs: http://www.delorie.com/djgpp/.
This software has been used at CCC Stage 2 and at IOI.