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scrcpy is an application for displaying and controlling your Android device through USB connection (or over TCP/IP). It is cross-platform (GNU/Linux, macOS and Windows) and does not require any root access.
scrcpy displays only the device screen but offers great performance (30~60fps) and quality (1920×1080 or above). It’s got low latency (35~70ms) and a very low startup time (less than a second).
unpaper is a post-processing tool for scanned sheets of paper, especially for book-pages scanned from previously created photocopies. unpaper tries to remove dark edges, corrects the rotation ("deskew"), and aligns the centering of pages.
A command-line tool to download picturs and control still digital cameras based on Sierra Imaging chipset and compatibles (Olympus, Nikon, Epson, Agfa and some others).
Tifftool is a high-performance tool to clean scanned documents in preparation for onscreen display or for OCR. Features include skew correction, orientation correction, despeckle, page alignment, split pages and batch processing.
GAS - Gtk Advanced Screenshots - is an advanced screenshot making tool. With it, you can capture all or part of your screen, save it, and if needed open it for edition, in only one action.