[lstamour]

Pretty sure the app was Skitch. https://www.pcmag.com/reviews/skitch-for-mac I used to love it for that feature too.

On Windows a similar app was Jing. https://en.m.wikipedia.org/wiki/Jing_(software) but the Skitch app could also really easily add text, and had a neat way of dragging and dropping the tab containing the filename to save a file to a particular location or send it somewhere that you rarely see today. It wasn’t intuitive but it was easy once you knew how, like dragging the file icon from the window title bar (a hidden feature of only some document-based macOS apps).

Turning on zooming likely refers to https://support.apple.com/en-ca/HT210978 which was a feature added to Snow Leopard (maybe) where you could hold the control key and use the mouse wheel or Magic Mouse to zoom in.