Open source isn't eating all proprietary software. Open source is enabling proprietary software to be more profitable, because it makes free all the commodity pieces that are needed to make proprietary software work. Customers would otherwise have to pay for these things (in an ongoing manner) leaving less of their $$$ to spend on your payload. Open source powers SaaS which is so closed and proprietary that the user…
The desktop OS market has basically two players: Windows and Mac OS. Desktop Linux is so small it's no relevant force at all.
> development tools
What about the intellij tools? They cost quite a large amount, and it's a monthly cost. MS Visual Studio is still around as well.
> databases
SAP is still a major force on the German market. The company behind it is amongst the 30 biggest public German companies.