The following is miscellaneous software development software.
Flex and Bison are based on Lex and YACC. The Windows version is available
from Win flex-bison
download | SourceForge.net. See my Flex page
for some help with it.
The Boost C++ Libraries are very useful. They
are used by many, and probably most, experienced C++ programmers. The main
reason I have not used them much is that VC versions 6 and prior are not
compliant with the C++ standard, so much so that the Boost libraries have
problems with the compiler.
WinPcap, The Packet Capture and Network
Monitoring Library for Windows "is the industry-standard tool for
link-layer network access in Windows environments". It is very useful for
low-level network programing.