MiniCap
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MiniCap is a minimal screenshot capture app, with good commandline support, including the ability to launch (and then terminate) apps, capture windows by handle, processid, process name, or interactively.
MiniCap has a convenient interactive capture mode (based on Screenshot Captor´s Redbox Capture mode) which may be useful if you don´t want to have something like Screenshot Captor running in the background. But where MiniCap really shines is it´s use as a non-interactive commandline tool.
