C++ 6 & 7 with visual assistent x extensions.
context
masm

OS: linux 2.6
Compiler: gcc 3.3/3.4-cvs and IntelC 8
Debugger: GDB 6
IDE: kDevelop / Anjuta
raster graphics: gimp 2
modelling: Blender

OS: Windows XP
Compiler: gcc 3.3.1, IntelC 8 and MSVC++.NET 2003
Debuger: GDB 5.3 and Visual Studio''s one
IDE: Visual Studio .NET 2003

apis: gtk+, opengl, sdl.
I always use all compilers since I don''t want my code to become compiler-dependant. IntelC sucks on linux - like gcc 3.4.0 will ( PR14566, "Inhibiting Variables", won''t be fixed until the release of 3.4.1 ).

OS: Windows XP Pro
IDE/Compiler/Debugger/Etc: Microsoft Visual Studio .Net 2002 Academic

A long time ago, I used Borland C++ (3 up to 4.5 - I had an upgrade to 5, but it was unstable on all my machines) for everything, but they quit making it (at least afaik Borland C++ Builder replaced it) so I decided it was time to switch over. I like MSVSDN, but I wish I would have waited for 2003 to get partial template specialization in C++. I find even Borland C++ 3.0 much, much better than any free IDE I've seen for windows.

At an internship I had last summer and probably this one:
OS: Redhat 6.2
Compiler: GCC something (don't remeber version, but it was an old version as well)
The company uses a modified and heavily updated version based on RedHat 6.2, but its classified or something so all us interns had the pleasure of using regular Redhat 6.2

[edited by - Extrarius on April 6, 2004 3:40:15 PM]