Most of the technologies you have enumerated only have mind-share on places like Reddit & HN. The exception is Ruby, which is still a drop in the ocean when com

Most of the technologies you have enumerated only have mind-share on places like Reddit & HN. The exception is Ruby, which is still a drop in the ocean when compared to big players like PHP or Java. I'll give you the benefit of doubt and assume that you're just joking with Haskell and Scala. There are exactly ZERO Haskell jobs available in my country. Second of all, those technologies are not Linux-centric, they are all cross-platform. A one-OS programming language/library is worthless in the present, except in rare cases such as specialized hardware-software solutions or in-house software.