The first was in the parts of the SAP R/3 kernel that I touched while working in the LinuxLab there (I can't say authoritatively for the entire kernel), the sec

The first was in the parts of the SAP R/3 kernel that I touched while working in the LinuxLab there (I can't say authoritatively for the entire kernel), the second was at Native Instruments, largest pro-audio software company. Naturally the largest C++ Open Source project, KDE, tends towards Qt-style (being built on Qt). I'm not sure for Mozilla and OpenOffice. At the latter company we had about 30 developers, on average quite good. There were a couple that were into advanced template techniques, but the usage of such in the code was usually quite limited. My feeling, though this could probably be better answered by folks that are fans of said template techniques, is that the primary usage of such happens in academia and smaller shops.