Search and Replace for Windows (that nifty little tool with blue binoculars icon), HxD - Hexeditor, Sublime Text, Visual Studio Express (web and desktop), Beyond Compare, MS Paint, GIMP, sometimes Inkscape, Calculator, Glary Utilities (This was a lifesaver when I accidentally deleted source copy instead of last modified backup copy of code I had written all day. I learnt a lesson - never do file delete at 2 AM when tired and sleepy). All these are pinned to the task bar, except calc which I can just start->run.
I try to depend on as little as possible. A text editor & access to some sort of programming language. If my terminal dies I want minimum downtime. If my laptop dies, ditto. That's not to say tools aren't useful but relying on them is trouble.
The same reason I leave my shovel and rake in the garage when I do lawn work.