(please avoid the typical word and excel software)
While it may seem like a "canned response" the reality is that these two programs plus an email client make up, by my non-scientific estimation, something to the order of ~98% of SM software use.
Also, the search bar is your friend here. I'd start at the link below and work your way through some of the old threads over in Tools of the Trade. If what you're looking for hasn't been covered yet then I'd recommend starting a topic with specific questions; vague questions beget vague responses.
The community is here to help, but we need something a bit more than "What is some useful software/equipment?"
FAQ - Computer Software