What are really useful modules to have for office related work? (Or generally, for any job)

Modules that convert to/from CSV are really useful since excel is used everywhere in almost any job. I also find the "opn" module useful (opens up links in browser, and any .exe file etc)What are some other interesting/useful/honorable mentions?

Submitted February 16, 2017 at 12:10AM by LuCas23332