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Text, code and hex editor.
PS Pad is a plain text editor with lots of useful formatting functions, spell check and a web-authoring editor. It catches and parses compiler output, integrates external help files, compares versions and more. MattF tells us "There are lots of text editors on the market, but this one is my favorite [for its] simplicity, the number of filetypes it works with, tools including diff and lorem and the extremely small...
Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.
ASCIIFlow is a online tool that allows you to easily design text diagrams you can then export with ASCII Characters. Dvst tells us, "For really basic, dead simple diagramming I like ASCIIFlow.”.