Programming languages are like tools. Different tools are better for different tasks. Hammers are useful for certain tasks, and saws are useful for other tasks. The same is true of programming languages and other programming tools.
For example, one construction company might get their wood from a place that only sells full-sized logs, which they then have to saw into individual lumber pieces. Another company might get their wood from a place that sells individual lumber pieces, so they don't have to saw it themselves. That first company would require more saws than the second company.
Even with C++, there can be differences. Maybe one company is working with a legacy system that requires them to use a particular version of C++, but another company is only working with a single system so they can use the latest and greatest version.
Each company is working towards a slightly different set of goals, so their technology (the set of tools they use) is going to be slightly different. You aren't going to find a single source of "standard software" because there's no such thing.