Overview of HEP software

[ynikitenko]

In #31 there was mentioned a "typical HEP analysis". It would be interesting to get an overview of contemporary HEP software tools and practices, including:

• tools for scientific workflow. From low level to tools for prepared publications,
• balance between custom (local) and general (open source, free) tools in an experiment,
• Python vs other languages in an experiment,
• collaboration software for its managers vs users (e.g. a student vs a person responsible for collaboration analysis),
• balance between HEP and general software (purely scientific vs common testing, documentation frameworks, etc.)
• main problems/challenges/desires for the existing scientific software.